Residents of a Gaza town complained this week after Hamas forces constructing a weapons storage facility under the local schoolhouse severed a water main.
The Ramallah-based Palestine Press news agency reported that Hamas hoped to use the school to shield some of their heavy US and Iranian-made weapons from Israeli raids and air strikes.
In other Gaza news, Hamas gunmen on Thursday bombed a cemetery where British soldiers who helped liberate the area from Ottoman Turkish rule during World War I are buried.
The Palestinian Center for Human Rights later reported that two of its workers and two accompanying Reuters correspondents were attacked by Hamas security forces when they arrived at the scene to interview cemetery guards. The Hamas police reportedly confiscated the reporters' camera memory cards and all video footage taken at the site.