Deputy Hamas chief in Gaza, Khalil Al-Hayya, told Al Jazeera television: "We can say that actions led by the United Nations and Egypt are in advanced stages and we hope it could yield some good from them".
Jamie McGoldrick, the United Nations' humanitarian coordinator for the Palestinian territories, in a news release called Israel's restriction of fuel imports "a unsafe practice, with grave consequences on the rights of people in Gaza".
Israel carries out regular attacks on Palestinians in Gaza under the pretext of hitting Hamas targets.
Israel said it struck a Hamas post in retaliation.
The Israel Defense Forces hit 12 Hamas positions across the Gaza Strip, including a factory that produces concrete for terror tunnels, late Wednesday night after several dozen rockets were fired on southern Israel by the Hamas terror group.
Gaza's Health Ministry said three Palestinians were slightly injured in the strikes.
According to the Israeli military, at least 11 rockets were intercepted by the Iron Dome aerial defense system, while a majority of the remaining rockets hit open areas.
It said about 150 rockets had been launched from Gaza towards Israeli territory.
Israeli tanks fired shells at Palestinian resistance movement Hamas' posts in northern Gaza after shots were reportedly fired from the other sides of the border.
Israeli media reported several residents of Sderot and other border towns were wounded by rocket fire.
Clashes along the Gaza border since the end of March have seen at least 163 Palestinians killed by Israeli fire. Twenty-four of the slain protesters were minors, the ministry has said.
The nearly daily airborne arson attacks have been part of months of weekly border protests led by the Islamic militant group Hamas that rules Gaza aimed in part at drawing attention to the Israeli-Egyptian blockade imposed after it took control of the territory in 2007. The IDF later suggested the incident was a misunderstanding, as the tank returned fire in response to the shots fired as part of a ceremony of the al-Qassam Brigades, which were not deliberately aimed at Israeli soldiers, Haaretz reported.
The Swedish government confirmed that all the Swedes had been sent home on Wednesday, while the Ship to Gaza activist group said shortly before midday that "most of [the activists] are already in transfer".