Tel Aviv - Israel's Defence Ministry said Thursday it was keeping the crossing points into the Gaza Strip shut again for the day, in response to three rockets fired from the salient on Tuesday which violated a fragile truce with Palestinian militants.
Major Peter Lerner said an "ongoing assessment" was taking place as to whether the crossings would reopen on Friday.
Israeli Defence Minister Ehud Barak decided to close the crossings on Wednesday after the rocket attacks on southern Israel.
Hamas, the main Palestinian militant group, said the Israeli move was in itself a violation of the ceasefire.
The truce went into effect at 0300 GMT on June 19, and is supposed to end months of violence between the sides.