Palestinian media reported that IDF forces opened fire on Sunday morning at a site belonging to the Islamic Jihad terrorist organization in the southern Gaza Strip.

The forces also reportedly deployed heavy engineering equipment on the southern Gaza border, near the city of Khan Younis, including almost a dozen bulldozers and excavators.

According to the reports, nobody was harmed by the IDF fire, which was directed at an observation post for the Islamic Jihad’s military wing, the Al-Quds Brigades.

Israeli officials have not yet confirmed the reports.

The reported military activity comes amid Israel’s ongoing project to locate tunnels dug by Hamas into Israeli territory to carry out terror attacks inside Israel. Israel has struggled for years with the vexing threat posed by Hamas tunnels, most notably during Operation Protective Edge in 2014 in which Hamas fighters used dozens of tunnels from Gaza to attack Israelis.

Two Hamas tunnels have been discovered in recent months, and Prime Minister Benjamin Netanyahu has revealed that this is due to a “breakthrough” technological innovation. Israel is also reportedly planning to deal with the tunnel threat by building a concrete wall along the Gaza Strip border that would extend tens of yards underground.