Israel has closed its cargo crossings with the Gaza Strip following a Palestinian rocket attack on southern Israel that violated a truce.
The rocket exploded in open field late Tuesday and caused no injuries or damage. No group claimed responsibility.
Israel and Gaza's Hamas rulers have been observing a truce since June. But Gaza militants have sporadically violated the deal by firing rockets and mortars into Israel.
Prior to the agreement, militants shelled southern Israel almost daily.
Israel imposed a blockade on Gaza after Hamas seized control of the territory last year. Under the truce, Israel has gradually reopened the borders. Gaza residents heavily depend on the crossings for basic goods.
Israel's defense ministry says the crossings will stay closed for at least 24 hours.