British lawmaker David Amess, a member of Boris Johnson's ruling Conservative Party,
died after being stabbed several times at a constituency meeting east of London.
Amess, 69, a member of Parliament who represented Southend West in Essex, was attacked at around midday Friday by a man who walked into a meeting with voters from his electoral district being held in a Methodist Church in Leigh-on-Sea.
"He was treated by emergency services but, sadly, died at the scene," Essex police said.
Here's what else we know about the investigation:
The suspect: A 25-year-old man arrested on suspicion of murdering
Amess on Friday is believed to be a British national with Somali heritage, official sources have told the PA news agency. "A 25-year-old man was quickly arrested after officers arrived at the scene on suspicion of murder and a knife was recovered," Essex police said.
The investigation: The UK's Counter Terrorism Command will lead the investigation into the murder, police said later Friday. "It will be for investigators to determine whether or not this is a terrorist incident. But as always, they will keep an open mind," Ben-Julian Harrington, Chief Constable of Essex Police, told reporters.