The Ministry of Interior said on its twitter account "police dealt with a group of thugs outside Jabriya school according to legal regulations".

BBC: Bahrain: Police 'fire tear gas' at boys' school

But he also expressed surprise it was not dealt with five years ago, in a statement released on the Conservative group's website.

BBC: David Sprason

Under the deal which brought the siege to an end, the group were expected to face trial in a Palestinian court, but it is now unclear how they will be dealt with.

BBC: Bethlehem militants fly into exile