Israeli troops have raided the West Bank town of Nablus, shutting down three facilities of a Hamas-affiliated charity and a medical centre, Palestinians say.

Monday's raid, which appears to have been part of an intensified crackdown on Hamas in the West Bank by Israel and the Palestinian Authority, targeted al-Tadamon (Solidarity) charity.

Adli Yaish of Hamas, who is Solidarity's chairman and mayor of Nablus, has been in an Israeli jail since June 2006.

Dozens of jeeps and two bulldozers entered the town early on Monday, closing a girls' school and sports club operated by the charity and confiscating computers, documents, cash and furniture, witnesses said.

"Now we need to look for an alternative place to educate these girls," Fidda Draikh, principal of the 160-student school, said.

"We cannot leave them without a school."

The Israeli military had no immediate comment on the Palestinian reports.

'No Hamas ties'

The shuttered medical centre has no ties to Hamas, Dr Hafez al-Sadr, the facility's director, said.

He said though the unit has the same name as the charity, it is run by a different charitable organisation that was controlled by Hamas until the government President Mahmoud Abbas replaced its chief administrator last year.

Though Israel is trying to negotiate a peace deal with the Palestinian Authority (PA), troops also raided Nablus offices of the PA's ministry of religious affairs.

Three weeks ago, Israel and Palestinian militants in Hamas-ruled Gaza agreed to a truce.

But citing confrontations between Israel and Hamas in the West Bank, Gaza fighters have already violated the agreement.