LEIGH-ON-SEA, England >> A long-serving member of Parliament was stabbed to death today during a meeting with constituents at a church in England, an attack that united Britain’s fractious politicians in shock and sorrow. A 25-year-old man was arrested at the scene.

Police gave no immediate details on the motive for the killing of 69-year-old Conservative lawmaker David Amess and did not identify the suspect, who was held on suspicion of murder.

The attack came five years after another MP, Jo Cox, was murdered by a far-right extremist in her small-town constituency, and it renewed concern about the risks politicians run as they go about their work representing voters. British politicians generally are not given police protection when they meet with their constituents.

Prime Minister Boris Johnson said he and his Cabinet were “deeply shocked and heart-stricken.”

“David was a man who believed passionately in this country and in its future, and we’ve lost today a fine public servant and a much-loved friend and colleague,” Johnson said.

The prime minister would not say whether the attack meant politicians needed tighter security, saying, “We must really leave the police to get on with their investigation.”

Essex Police said officers were called to reports of a stabbing in the town of Leigh-on-Sea just after noon. They arrested a man and recovered a knife.

“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,” police said.

Sky News and other media said Amess was attacked during a regular meeting with constituents at a Methodist church in a residential section of the seaside town about 40 miles (62 kilometers) east of London. Paramedics worked at the scene without success to save his life.

Amess had been a member of Parliament for Southend West, which includes Leigh-on-Sea, since 1997, and had been a lawmaker since 1983, making him one of the longest-serving politicians in the House of Commons.

A social conservative on the right of his party, he was a well-liked figure with a reputation for working hard for his constituents and campaigning ceaselessly to have Southend declared a city.

He was knighted by Queen Elizabeth II in 2015 for his service, becoming Sir David.

Politicians from across the political spectrum expressed shock and sorrow at the death of Amess, who leaves a wife and five children. Flags at Parliament were lowered to half-staff.

“This is an incident that will send shockwaves across the parliamentary community and the whole country,” House of Commons Speaker Lindsay Hoyle said. “In the coming days we will need to discuss and examine MPs’ security and any measures to be taken, but for now, our thoughts and prayers are with David’s family, friends and colleagues.”

Violence against British politicians is rare, but concerns have grown in recent years about the increasingly bitter polarization of the country’s politics. Several people have been jailed in recent years for threatening British lawmakers.

In 2016, a week before the country’s divisive Brexit referendum, Cox, a Labour Party lawmaker, was fatally stabbed and shot in her northern England constituency. An extremist was convicted.

Cox’s widower, Brendan Cox, tweeted today: “Attacking our elected representatives is an attack on democracy itself. There is no excuse, no justification. It is as cowardly as it gets.”

British lawmakers are protected by armed police when they are inside Parliament, and security there was tightened after an attacker inspired by the Islamic State group fatally stabbed a police officer at the gates in 2017.

But politicians have no such protection in their constituencies. Amess published the times and locations of his open meetings with constituents on his website.

Two other British lawmakers have been attacked over the past two decades during their “surgeries,” regular meetings where constituents can present concerns and complaints.

Labour legislator Stephen Timms was stabbed in the stomach in 2010 by a student radicalized by online sermons from an al-Qaida-linked preacher.

In 2000, Liberal Democrat Nigel Jones and his aide Andrew Pennington were attacked by a man wielding a sword during such a meeting. Pennington was killed and Jones wounded in the attack in Cheltenham, England.

Former Prime Minister Theresa May, a Conservative, tweeted that Amess’ killing was a “tragic day for our democracy,” and former Labour Prime Minister Tony Blair said he was “shocked and horrified.”

Conservative lawmaker Tracey Crouch tweeted: “Heartbroken. I could write reams on how Sir David was one of the kindest, most compassionate, well liked colleagues in Parliament. But I can’t. I feel sick. I am lost.”

Scottish First Minister Nicola Sturgeon of the Scottish National Party said on Twitter: “In a democracy, politicians must be accessible and open to scrutiny, but no one deserves to have their life taken while working for and representing their constituents.”

Archbishop of Canterbury Justin Welby, head of the Church of England, said the killing was a blow to “everyone who desires a peaceful and flourishing democracy.”