Three Palestinians were injured Friday in riots against Israel Defense Forces troops in the Balata refugee camp near Nablus, the Ma’an news agency reported.

The incident comes after an explosive device was activated Friday morning against IDF troops operating along the security fence in the southern Gaza Strip. No injuries were reported in the incident.

Israeli forces responded with tank fire at suspected lookout posts near Khan Younis on the Palestinian side of the Gaza border, the IDF Spokesperson’s Unit reported.

Palestinian media reported six injured by the IDF retaliatory fire, including one in critical condition. A pregnant woman and an 11-year-old boy were said to be among the wounded, and two mosques were damaged, according to Ma’an.

The attack followed an incident Sunday in which a lone terrorist from the Gaza Strip, armed with a grenade, managed to cross the border into Israel unchallenged.

The inquiry into the incident ended on Thursday with two officers being dismissed from their posts and several other soldiers being disciplined.

The incident occurred in the Eshkol Region, adjacent to the southern Gaza Strip. After scaling the fence in the middle of the night, a Palestinian man, armed with a hand grenade, walked five kilometers through Israeli territory before finally being safely apprehended by a civilian security officer near Moshav Yated.

IDF officials believe the man acted alone and was not sent by a terrorist organization.

Stuart Winer contributed to this report.