The Islamic State’s branch in the Sinai Peninsula claimed responsibility for a rocket attack on a southern Israeli community on Monday, shortly before the beginning of the Passover holiday.

“The fighters of the Islamic State have bombed the Jewish settlement in southern Palestine with a Grad rocket,” Sinai Province declared in a statement. The rocket landed on a greenhouse in Yuval, a town in Israel’s southern Eshkol region that borders Egypt and the Gaza Strip. While no one was injured, a 50-year-old man was treated for an anxiety attack.

Sinai Province, which has an estimated 800 to 1,000 members, also claimed responsibility for firing four rockets at the Israeli resort city of Eilat in February, ominously warning, “The future will be more calamitous with Allah’s permission.”

Sinai Province was founded in 2011 under the name Ansar Bayt al-Maqdis, with the purpose of attacking Israel and disrupting a natural gas pipeline between Egypt and Israel. In 2014, Ansar Bayt al-Maqdis swore loyalty to ISIS and adopted its current name.

The Sinai-based jihadists have close ties to the Palestinian terrorist group Hamas, with one Egyptian official observing that Hamas transformed Sinai Province from “a gang of Bedouin with light weapons into a well-trained, well-armed group of 800 militants.” These close links have enraged the Egyptian government and army, which are frequently targeted by Sinai Province.

Hamas provides medical care to Sinai Province fighters and helps the ISIS affiliate smuggle weapons into Egypt, the Times of Israel reported in December. Arik Agassi reported for The Tower in January 2016 that the alliance between Hamas and Sinai Province, which also includes funding and military training, serves as part of Iran’s plan to establish its hegemony across the Middle East.