The French government has proposed six-month travel bans to stop citizens travelling to Syria and Iraq to fight alongside Islamist militants.

A new offence of creating an “individual terrorist enterprise”, designed to counter the threat of so-called “lone wolves”, will also be established.

Government officials say that two or three young Muslims leave France every day to join Islamist groups abroad.

There are fears they will eventually pose a threat to France itself.

A French citizen arrested for the killing of four people at the Brussels Jewish Museum in May, Mehdi Nemmouche, had returned from Syria, after being radicalized in prison.

Another French-born jihadist, Mohammed Merah, killed seven people in Toulouse in 2012 before being shot by police. His victims were three paratroopers as well as three children and a teacher at a Jewish school.

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Israeli Prime Minister Benjamin Netanyahu has vowed to “further intensify attacks on Hamas” in the Gaza Strip after talks with his defence chiefs.

Netanyahu says the Palestinian militants would “pay a heavy price” for their rocket attacks on Israel.

Israel’s military says Hamas had fired 72 rockets at Israeli cities on Wednesday, after dozens of air strikes were carried out in Gaza overnight.

Some 40 Palestinians are reported to have died in the hostilities.

The officials say half the casualties were civilians, a number of them women and children.

Hamas has warned that all Israelis are now targets.