Conservative MP Sir David Amess has died after being stabbed multiple times at a meeting with constituents.

Here is what we know so far:

– The Southend West MP was fatally injured at Belfairs Methodist Church in Leigh-on-Sea, Essex, at midday on Friday and died at the scene.

– Essex Police said the response of the emergency services was immediate and officers arrived at the scene within minutes.

– A 25-year-old man was arrested immediately at the scene on suspicion of murder.

– Police on Saturday were granted a warrant of further detention, which allows detectives to hold the man until October 22. He is in custody at a London police station.

– The PA news agency understands the name the police have for the suspect is Ali Harbi Ali.

– Official sources have told the PA news agency that the man is believed to be a British national with Somali heritage.

– Metropolitan Police declared the incident an act of terrorism, with early investigations revealing “a potential motivation linked to Islamist extremism”.

– Police said a knife was recovered.

– Southend councillor John Lamb, a friend of Sir David, said the attacker was waiting at the church to see the MP and “drew a knife and stabbed him” when he was called.

– As part of the investigation, officers were carrying out searches at three addresses in the London area, Metropolitan Police said. One search has now concluded.

– Police officers were seen at properties in Lady Somerset Road, Kentish Town, and Bounds Green Road in north London, as well as in Cranmer Road, Croydon, south London.

– The forensic tent set up outside the address in Kentish Town has been taken down by police.

– A post-mortem examination took place on Saturday, police said, but its findings have not yet been released.

– Sir David’s family has said they are “absolutely broken” by his death, adding in a statement: “As a family, we are trying to understand why this awful thing has occurred. Nobody should die in that way.”

– Prime Minister Boris Johnson, Home Secretary Priti Patel, Labour leader Sir Keir Starmer and Commons Speaker Sir Lindsay Hoyle have visited the scene and laid flowers in tribute to Sir David.

– Sir Lindsay said there will need to be a discussion in the coming days around MPs’ security and any measures that should be taken.

– Ms Patel has asked all police forces to review security arrangements for MPs “with immediate effect”, and said measures will be put in place “for the security of MPs so that they can carry on with their duties”.

– The National Police Chiefs’ Council said every UK MP will be contacted by Operation Bridger, a nationwide police protective security operation established in 2016, to discuss safety precautions.

– Mr Johnson said Sir David was “one of the kindest, nicest, most gentle people in politics”, while former Conservative prime minister Theresa May said his death was “heartbreaking”, adding: “A tragic day for our democracy.”

– Flags were lowered to half-mast outside Parliament following Sir David’s death.

– A special service was held in memory of Sir David at St Michael’s and All Angels church opposite his constituency office in Leigh-on-Sea.

– MPs will pay tribute to Sir David in the House of Commons on Monday.