Israeli troops raided Nablus city hall on Wednesday, the deputy mayor said, in what appears to be part of an ongoing crackdown on institutions the army believes are linked to Hamas in the West Bank.

Deputy mayor Hafez Shaheen said troops also raided six mosques in the city and seized five buses belonging to schools close to Hamas, the Islamic militant group that rules the Gaza Strip. Shaheen said the troops confiscated five computers from city hall.

The military had no immediate comment.

Nablus’ mayor, Adli Yaish, is a Hamas politician who has been imprisoned by Israel.

This week, troops have raided and shut down various Nablus facilities it says are connected to Hamas, including the city’s shopping mall.

The raids may also be an Israeli effort to bolster Palestinian President Mahmoud Abbas, who is in a fierce rivalry with Hamas. Hamas violently wrested control of the Gaza Strip from Abbas’ forces a year ago.

Businesses planned a general strike Wednesday in to protest the crackdown in Nablus, a city of 135,000 that serves as the West Bank’s commercial center.

Also Wednesday, Israel opened a Gaza cargo crossing for business despite mortar fire from Gaza a day earlier. Israeli military officials said the Sufa crossing would operate normally.

Under a three-week-old truce, Israel is to expand the flow of goods into Gaza, which has been largely cut off from the world since Hamas took over.

Israel has repeatedly closed Gaza’s crossings in response to rocket fire from Gaza since the truce took effect, but officials agreed on Tuesday to an Egyptian request to reopen the borders.