By Raneen Sawafta and James Mackenzie JENIN, West Bank/JERUSALEM (Reuters) -Israel sent tanks into the occupied West Bank for the first time in more than 20 years on Sunday as it ordered the military to prepare for an "extended stay" to fight Palestinian militant groups in the area's refugee camps.

Israel launched a major military incursion in the northern West Bank in August, which it called “Operation Summer Camps.” It sent armored vehicles into the cities of Jenin and Tulkarem, severing water and electricity and leading Palestinians to ration food, residents told CNN.

Israel’s defense minister, Israel Katz, said that 40,000 Palestinian residents displaced from militant hotbeds would not be allowed to return to their homes.

Israeli tanks moved into the occupied West Bank on Sunday for the first time in decades in what Palestinian authorities called a “dangerous escalation,” after the defense minister said troops will remain in parts of the territory for a year and tens of thousands of Palestinians who have fled cannot return.

Israeli tanks moved into the occupied West Bank for the first time since 2002 on Sunday, shortly after Israel's defence minister said troops will remain 'for the coming year' in parts of the Palestinian territory.

Israeli tanks have moved into the occupied West Bank for the first time since 2002, shortly after the defense minister said troops will remain “for the coming year” in parts of the territory and indicated that Palestinians who have fled cannot return.