Israel's military has begun firing shells into the northern Gaza Strip in an effort to enforce a buffer zone to prevent militant attacks.
Palestinian witnesses said one militant was injured in the attack late Wednesday.
Earlier, Israeli aircraft dropped leaflets over northern Gaza, warning residents to avoid entering the "no-go" zone near the border with Israel.
Israeli officials said the shelling is needed because militants have been approaching the border to fire rockets into Israel since Israel withdrew from the area earlier this year.
Palestinian President Mahmoud Abbas condemned the Israeli action, saying Israel has no right to try to reassert control over parts of Gaza. Elsewhere in Gaza, gunmen kidnapped three British citizens.
There was no immediate claim of responsibility. And Israeli military jets attacked a site in southern Lebanon reportedly used by Palestinian militants, injuring two militants.
Information for this report is provided by AP, AFP and Reuters.