A security insider said: “MPs are legitimate targets in the eyes of terrorists. Ministers who are in Metropolitan areas, where there are UK jihadists who have returned from Syria, are right to remain vigilant.
“The definition of a terrorist attack is the threat of violence or actual violence against someone to force the government of the day to change their principal policies.
“Who makes the decisions? The MPs do. They are members of the establishment seen as being more responsible for the bombing of Islamic State targets in Iraq and Syria than RAF personnel.”
Serving MPs have been told to increase security in their homes amid fears of attacksISIS.
ISIS has a political assassination unit aimed at Government officials.
The definition of a terrorist attack is the threat of violence or actual violence against someone to force the government of the day to change their principal policies An insider The source added: “Those MPs who recently voted in favour of bombing Syria will also be more at risk.”
In 2010, Stephen Timms, Labour MP for East Ham, was stabbed in his constituency office in east London by Islamist Roshonara Choudry, 21, because he voted for the Iraq War.
She was jailed for life for attempted murder.
Last week at least one MP was believed to have raised fears about a potential jihadi threat at a security briefing.
Parliament’s security director Paul Martin also spoke to MPs about personal security.
An MP said: “While security in and around Parliament is very tight, concern was raised about the potential threat to staff and family members back in the constituencies.”