Israel halted fuel deliveries to the Gaza Strip after Palestinian terrorists shelled a border depot.
A mortar bomb struck Nahal Oz early Wednesday, seriously wounding a Palestinian worker.
Israel declared the depot closed until further notice, a by-now standard response to attacks on border crossings where vital imports are brought into the Hamas-ruled territory.
Though Hamas in the past has claimed responsibility for shelling and shooting targets on the Israel-Gaza border, this time the faction disavowed the Nahal Oz attack.
The Hamas government said it was trying to talk other Palestinian terrorist groups into holding fire against border crossings.