An unarmed Palestinian man was apprehended by security forces on Saturday after he crossed the security fence separating Israel from the Gaza Strip.

The man was delivered to the Shin Bet security service for interrogation.

His arrest came a day after tens of thousands of Palestinians gathered along the Gaza border, burning tires and throwing firebombs and rocks at Israeli soldiers, who responded with tear gas and live fire.

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Nine Gazans were reported killed and over 1,000 injured by Israeli fire at the border protests. It was the second Friday in a row that the Palestinians held a “March of Return” protest at the border.

The IDF, which did not confirm the figures, said it thwarted multiple efforts to breach the border fence as well as attempts to activate bombs against the troops under the cover of smoke.

The recent weeks of unrest have seen multiple attempts by Palestinians, most of them unarmed, to cross into Israel.

Last Monday, Israeli troops picked up two unarmed Palestinians who crossed the Gaza security fence and entered Israeli territory, the army said.

The suspects were arrested shortly after they crossed into southern Israel, near the Eshkol region, and were handed over to the Shin Bet for questioning.

On Sunday evening, Israeli security forces arrested three unarmed Palestinians who crossed the border from the Gaza Strip into Israel.

The suspects were picked up just after they got past the fence in the southern Gaza Strip, the army said. They too were handed over to the Shin Bet security service for questioning, an army spokesperson said.

In the most serious infiltration incident, on March 27, a group of three Palestinian men walked more than 20 kilometers (12 miles) into the country, over the course of several hours, before they were arrested outside the Tzeelim army base.

They were found to be in possession of grenades and knives.

The army’s failure to immediately realize that there’d been a breach — signs of the infiltration were only found hours after it had happened — prompted Defense Minister Avigdor Liberman to call for a full investigation of the incident.