Explosions light-up the night sky above buildings in Gaza City as Israeli forces shell the Palestinian enclave, early on June 16, 2021.

The Israeli military said early Wednesday morning that it had used warplanes to raid compounds in Gaza after officials claimed that Hamas had sent incendiary balloons into Israel — the first such violence since a cease-fire between the two last month ended 11 days of fighting.

"A short while ago, warplanes raided military compounds belonging to Hamas, which were used as camps and meeting sites for terrorist operatives in Khan Yunis and Gaza districts," an Israeli Defense Forces spokesman said in a tweet on Wednesday, according to a translation. "Terrorist activities have taken place inside the compounds."