Israel has detained a 13-year-old Arab over possession of a gun and two cartridge clips at a boarding school in Jerusalem, police said Sunday.

“The police carried out a search in the room of a Palestinian minor aged 13 and a half years old living at a boarding school,” the police said in a statement.

A court has extended the period of his detention, it said, without providing further details.

Israeli lawmakers last week approved a bill allowing authorities to jail terrorists as young as 12 if convicted of “serious crimes” including murder and attempted murder.

The law was passed following the recent release of several terrorists involved in violent attacks on Israelis.

In 2015 two terrorists, aged 11 and 14, stabbed a security guard on the Jerusalem light rail.

AFP contributed to this report