GAZA CITY, Gaza Strip — Witnesses say Israeli aircraft fired missiles at smuggling tunnels and other Hamas targets in Gaza.
Hospital doctors say one man was killed in southern Gaza.
The Israeli military had no immediate comment.
The strikes early Friday came after Gaza militants fired a rocket at the Israeli city of Ashkelon, causing no damage.
On Thursday, Israeli aircraft dropped leaflets over Gaza, warning residents to stay away from tunnels and border areas. The tunnels run under Gaza's border with Israel.
The Israel-Gaza border has been relatively calm since Israel's military offensive in Gaza a year ago. However, low-level friction persists, with Gaza militants firing some rockets and mortars, and Israel responding with air strikes.