GAZA, Feb 13 (Reuters) - Several explosions rocked the Gaza Strip early on Monday, according to a Reuters witness, as Israel's military said it attacked an underground site used by the Palestinian enclave's Hamas Islamists to manufacture rockets.
The air strikes, in which there was no immediate word of casualties, followed what Israel described as its shooting down over the weekend of a rocket that had been fired over the border from Gaza.
Hamas cadres seized control of Gaza in 2007 and have fought several wars with Israel there since.
Palestinian sources said Israeli ground forces also fired on Hamas border positions on Monday.
Sirens sounded in Israeli towns near the Gaza border, warning of possible new rocket launches.