By Doug Faulkner
The Conservative group leader on Southend Borough Council Tony Cox has spoken of his devastation on learning of Sir David's death.
"I'm just numb. Words fail to describe the situation we find ourselves in," he said.
"I don't think it's fully registered yet what's happened, but one thing that's become enormously apparent is how loved Sir David Amess was.
“He was a great man, a great MP, a respected parliamentarian and respected by his residents. What we cannot lose sight of here is that a wife has been robbed of a husband and five children have been robbed of a father.
“Our thoughts are with his family and friends at this sad time.”Copyright: BBC
By Joseph Lee
Here is Essex Police's statement in full:
"A man has been arrested on suspicion murder after a man was stabbed in Leigh-on-Sea.
"We were called to an address in Eastwood Road North shortly after 12.05pm today (Friday, 15 October).
"We attended and found a man injured.
"He was treated by emergency services but, sadly, died at the scene.
"A 25-year-old man was quickly arrested after officers arrived at the scene on suspicion of murder and a knife was recovered.
"He is currently in custody.
"We are not looking for anyone else in connection with this incident.
"We want to thank the public who alerted us to the incident so quickly.
"We need anyone who saw anything or has CCTV, dash cam or doorbell footage to contact us.
"If you have any information you can submit a report online at https://www.essex.police.uk or use the 'Live Chat' button to speak to an online operator between 7am-11pm.
"Please quote incident 445 of 15 October.
"You can also call us on 101 or contact Crimestoppers anonymously on 0800 555 111."
Essex Police has released the following statement after the reported stabbing at Sir David Amess's constituency surgery:
"We were called to reports of a stabbing in Eastwood Road North, Leigh-on-Sea shortly after 12.05 BST today.
"Officers were on scene shortly after, arrested a man and recovered a knife. He is currently in custody.
"We are not looking for anyone else in connection with the incident and do not believe there is an ongoing threat to the wider public.
"We want to thank the public who alerted us to the incident so quickly."
By Isla Todd
By Matt Precey & Nikki Fox
BBC Look East