British police have charged Ali Harbi Ali, 25, with the murder of lawmaker Sir David Amess, saying his fatal stabbing at a meeting in his constituency was an act of terrorism.

Sir David’s murder has shocked Britain’s political establishment coming five years after another lawmaker was murdered, prompting calls for increased safety for members of parliament.

“We will submit to the court that this murder has a terrorist connection, namely that it had both religious and ideological motivations,” Nick Price, Head of the Crown Prosecution Service Special Crime and Counter Terrorism Division said on Thursday.

“He has also been charged with the preparation of terrorist acts. This follows a review of the evidence gathered by the Metropolitan Police in its investigation.”

Ali, the son of an ex-media adviser to a former prime minister of Somalia, is due to appear at London’s Westminster Magistrates’ court later on Thursday.

“There has been considerable speculation in the media about the background, history and motivation of the man now charged,” said Matt Jukes, London police’s Assistant Commissioner for Specialist Operations.

“I understand the huge level of public interest in this case, but now a charge has been brought, it is vitally important that everyone exercises restraint when commenting on it publicly, to ensure future court proceedings are not prejudiced in any way.”