Palestinians fired mortar from the Gaza Strip into the western Negev, another violation of the cease-fire with Israel.
Tuesday’s attack, which caused no damage, came hours after Israel reopened its border crossings with Gaza in response to a request by Egyptian intelligence chief Omar Suleiman.
Suleiman also said the reopenings would help with negotiations on kidnapped soldier Gilad Shalit, the Jerusalem Post reported.
The crossings had been closed early Tuesday in response to a mortar attack the previous day.
No group claimed responsibility for either attack.
About 15 Kassam rockets and mortar shells have been fired from Gaza since the beginning of the Egyptian-brokered truce between Israel and Hamas on June 19.