'Serious & troubling letters from @PoliceChiefs& @NCA_UK to @CommonsHomeAffs on preparations for 1 Jan, outlining the security downgrade if no negotiated agreement, inc impact on public protection, serious crime & counter terror.'

Lord Evans says it is 'absolutely vital' for Britain's security to maintain ties to Europol and EU nations.

Ulster Unionist Party leader Doug Beattie has claimed anti-Northern Ireland Protocol rallies are stoking tensions and his party can no longer support them.

On the 21st anniversary of the Omagh bombing, the prime minister's brinkmanship over a no-deal Brexit manages to be both morally indefensible and utterly stupid.

Demands for prime minister to reveal if dangers listed in ‘no-deal readiness report’ last autumn are still real – and whether they have grown because of pandemic.

UK government rejects ‘clunky institutional framework’ for foreign policy cooperation.

Police to lose access to database used more than 600 million times a year on 1 January.

Biometrics commissioner "deeply concerned" as Lib Dem Layla Moran tells HuffPost UK leaving pacts "will make Britain less safe".

Political extremism has increased since the 2016 Brexit referendum, the head of terrorism investigations in the North West has told BBC Radio Manchester.

Brexit is a Tory invention and pro-Europeans must still fight the prospect of EU exile, writes Will Hutton.

Neil Basu added that a no-deal EU exit would be "very bad" for policing.

As the UK’s last European commissioner, I know how welcome it is that a deal was struck—and how much remains to be done

Establishing the tax havens could make it harder to sign a trade deal with the EU.

Sir John Sawers says it would be hugely damaging if UK-EU relations collapsed to such an extent.

Real-time access to EU police databases has not yet been agreed in the negotiations

An alleged far-right terrorist has admitted stabbing a Bulgarian teenager after shouting that he wanted to “kill Muslims”.

Counter-terror police vow to thwart rise in violence driven by extreme-right ideologies.

Transport body warns UK lorries would need counter-terrorism safety certificates.

Our prime minister claims he wants to keep the Good Friday Agreement safe, yet his desire to push through a no-deal Brexit makes that impossible, Best for Britain CEO Naomi Smith writes.

British citizens will be less safe if ministers fail to retain access to “mission critical” European intelligence services after Brexit, according to the former Metropolitan Police commissioner Lord Condon.

Cooperation vital in the face of twin threats posed by Isis and Russia, warns Andrew Parker

Lord Ricketts attacks failure to acknowledge that fallbacks will be 'putting the safety of the public at risk'.

Police raid of Dean Morrice’s home found stockpile of chemicals and cache of terrorism manuals.

New IRA says border infrastructure would be ‘legitimate target for attack’. In an interview with Channel 4 News, the group said it was committed to ‘armed actions’ against border infrastructure – and ‘the people who are manning them’.

Brexit is helping the New IRA to recruit young supporters and continue its campaign of violence, senior members of the paramilitary organisation have said.

They said: 'We fully accept we cannot defeat the British militarily... but we will continue to fight for as long as they remain here'. / The New IRA, the paramilitary group behind the murder of journalist Lyra McKee, has said it will use Brexit tensions to recruit new members.

Counter-terror chief raises ‘deep concerns’ as key crime-fighting tools will be lost.

PSNI assistant chief constable George Clarke says no deal could be a "clarion call" for violent dissident republicans.

The relocation of the Port of Larne worker and his family is believed to be the first following a death threat from terrorists since 2011

Police on both sides of the open border fear if checkpoints return after Brexit they could become a target for militant groups opposed to peace in the region.

The signing of the Belfast Agreement in 1998 brought an end to decades of extreme political violence in Northern Ireland. But more than 20 years later, the peace process still faces threats and both loyalist and republican paramilitary groups continue to operate.

Panel including former US envoy appeals to UK and Irish governments to work together on paramilitary disbandment.

A “credible threat” from loyalist paramilitary groups in Northern Ireland may have had an influence on the Government’s decision to unilaterally extended the Brexit “grace period”, security sources and leading politicians have claimed.

Street disorder linked to Brexit has led to speculation about a resurgence of activity, says the Independent Reporting Commission (IRC) report.

‘Efficiency and effectiveness’ at risk as terror threat raised and crime becomes increasingly transnational.

We've put arrangements in place to maximise our own ability to stand on our own two feet,' says assistant chief constable.

Preparations being made at ‘every port and access point from Europe’, senior officer say.

A no-deal Brexit could prompt a year-long upsurge in dissident republican violence in Northern Ireland, a senior police commander has said.

The director of Europe’s oldest research centre on terrorism is “extremely worried” about the prospect of a hard border between Northern Ireland and the Republic of Ireland in the event of a ‘no-deal’ Brexit.

An independent unionist MP has warned the British Government that a no-deal Brexit will lead to "greater violence" by dissident republicans along the border which will spark a "backlash" from loyalists.

The United Kingdom’s Brexit plan appears to have prompted a wave of attacks from the so-called New IRA, a dissident group that never accepted the peace agreement signed by the Provisional Irish Republican Army two decades ago.

“What?!” - former prime minister is dumbfounded as her old nemesis suggests Brexit will help “intensify” the UK’s security. / Theresa May has ridiculed Michael Gove’s claim that Brexit could give intelligence and law enforcement services the power to “intensify” the security they provide for the UK.

The UK will be less safe if it fails to strike a post-Brexit security deal with the EU, Britain's top counter-terrorism officer has said.

Alternatives 'might need to be pursued', James Brokenshire tells inquiry - prompting demands to reveal how UK will be 'protected'.

Former security commissioner warns of ‘immediate impact’ on tackling terrorism and crime.

‘There are certainly instruments that we may not have access to’, Foreign Secretary says - after police chiefs warned of ‘major impact on counter-terrorism’

Former terror law reviewer David Anderson warns of serious impact on fight against cross-border crime.

'We would have to start again with a blank sheet of paper as to how we build up that cooperation with our European partners'

Access to vital EU crime-fighting databases could be lost, MPs told – after Theresa May warns they ‘keep us safe’.

‘We are perilously close to a line which, when crossed, will lock us all into a pattern all too familiar’ - Peter Robinson

Loyalist activist Jamie Bryson told the Northern Ireland Affairs Committee he was worried that the process of transition of paramilitary groups towards civilianisation had halted while concerns over post-Brexit trading arrangements remained.