An Israeli military spokesman declined to comment.

There were no immediate reports of casualties in any of the incidents.

Israel and Palestinian armed groups in Gaza reached a de facto ceasefire this week after the most intense flare-up of hostilities since a 2014 war, both sides signalling they did not want a wider escalation.

Militants from Hamas and Islamic Jihad fired dozens of rockets and mortar bombs at southern Israel throughout Tuesday and overnight into Wednesday, to which Israel responded with tank fire and air strikes on more than 50 targets in the small, coastal enclave.

Violence along the Israel-Gaza frontier has surged in recent weeks. At least 119 Palestinians have been killed by Israeli troops during mass demonstrations along the Gaza border that began on March 30.

Israel, which has drawn international condemnation for its use of deadly force, says many of those killed were Hamas members and militants trying to launch attacks under cover of the protests.

The Palestinians say most of the dead and the thousands wounded were unarmed civilians against whom Israel was using excessive force.

More than two million Palestinians are packed into the narrow coastal enclave. Israel withdrew its troops and settlers from Gaza in 2005, but citing security concerns, maintains tight control of its land and sea borders, which has reduced its economy to a state of collapse.

Egypt also restricts movement in and out of Gaza on its border.