"The damage being caused to agricultural lands in Israel is grave and deplorable, but collectively punishing almost two million people in Gaza by closing its only official crossing for the movement of goods is both illegal and morally depraved", it wrote on Twitter.
Israel also cut the area fishing boats are allowed to operate off Gaza's Mediterranean coast and blacklisted what it described as a pro-Hamas TV channel.
By which Hamas means Israel must not slap the dog that bites its hand.
Israel imposed sanctions on the Gaza Strip and its dominant Hamas Islamists on Monday in retaliation for attacks by Palestinians using burning kites and helium balloons carrying blazing rags.
Shark bites University of Miami student in Bahamas
She is upset at the way she has been stereotyped and accused of being social-media obsessed and careless. With her boyfriend's dad on photographer duty, she got in the water and took a series of photos.
Demonstrators demand an end to Israel's decades-long occupation of Palestinian land and its ongoing blockade, which has brought the impoverished Gaza Strip to the verge of humanitarian catastrophe.
"Hamas urges the worldwide community to immediately intervene", said Fawzi Barhoum, spokesman for Hamas, which is deemed a terrorist group by Israel and the West.
Translation: In addition (to closing the crossing), the extension of the Gaza Strip fishing zone to nine miles for the fishing season will expire, returning today to six miles.
The flaming kites have set fires to forest and farmland, and have done some damage, though inflicted few casualties. "The regional and worldwide silence on the siege imposed on the Gaza Strip for more than twelve years has encouraged the Israeli Occupation to continue its criminal actions in clear violation of human rights and global law".
The "Great March for Return" began on March 30 of this year, when thousands of Gazans demonstrated near the border fence separating Gaza from Israel and sometimes attempted to break through the fence. "Therefore, Hamas calls on the worldwide community to act immediately and prevent this crime and its risky consequences". "I will not go into details", he added. During the first march, 16 Palestinians were killed and hundreds were wounded.
The move tightens the blockade on Gaza, which has been in place since 2007.