OCCUPIED JERUSALEM, April 9 (IslamOnline.net & News Agencies) - A radical right-wing Jewish group on Wednesday, April 9, claimed responsibility for an explosion which injured 29 Palestinian children in a school in the northern West Bank, Israeli army radio said.

Calling itself "Revenge of the Babies," the group said in a message sent to the beeper of one of the radio's journalists that the blast was "to avenge the Jewish children killed by the Palestinians."

Palestinian security officials were interviewing children to establish exactly how the explosive device went off.

Initial reports indicated one of the children had found the device, thought to be an Israeli-made grenade, in the school and that it exploded while he was playing with it in a classroom.

The blast occurred in a school in the village of Al-Jarba, 10 kilometres (six miles) south of Jenin. Four of the injured were in serious condition, Palestinian medics said.

Israeli military sources did not rule out that the blast could have been the work of Jewish extreme nationalists.

A group also calling itself "Revenge of the Children" claimed responsibility for a bomb attack on a school in an Arab district east of Occupied Jerusalem in March last year.

In that blast, three Palestinian school pupils and a teacher were wounded.

A carnage was narrowly averted as two more bombs were found on the scene and defused, while a fourth explosive device was also discovered in time in a nearby community clinic.

That group had been previously unknown, police said. It was not clear if the same group was behind Wednesday's attack.

Police arrested four Jewish settlers from the Bethlehem and Hebron areas in the southern West Bank in May on charges of preparing the March attack.

Last September, in the village of Zif near Hebron in the southern West Bank, fears of Jewish extremists were again revived when a bomb went off in the toilets of a Palestinian school, leaving five children seriously wounded.