JERUSALEM, June 14 (Reuters) - Palestinian gunmen shot and wounded three Israeli policemen in an attack on their vehicle in the occupied West Bank on Monday, police said.

This was definitely a terrorist attack. It was carried out on an ordinary police vehicle and forces are now combing the scene, said police spokesman Micky Rosenfeld.

There was no claim of responsibility from any Palestinian group for the attack near the town of Hebron in the southern West Bank.

An ambulance service spokesman said two of the three policemen had been seriously wounded. All three were being taken to hospital, said the spokesman.

The number of attacks and casualties in the West Bank has dropped markedly in the past few years, but last month armed settlers shot dead a Palestinian teenager near the city of Ramallah after he threw rocks at their car.

Some 500,000 Jewish settlers and about 2.5 million Palestinians live in the West Bank and areas near Jerusalem annexed by Israel after a 1967 Arab-Israeli war. (Writing by Ori Lewis; Editing by Ralph Gowling)