Islamic extremists killed nine people and injured four in Borno state in northeastern Nigeria, authorities said Sunday, Associated Press reported.

The attack was carried out by Boko Haram militants on the Malam Fatori community, Babagana Zulum, the state governor, said. He did not say when the attack happened.

The community, very close to the border of Chad, is about 270 kilometers (167 miles) from Maiduguri, Borno’s capital city.

The governor, represented by Sugun Mai Mele, the commissioner for local governments, visited the community and warned residents against collaborating with Boko Haram militants, according to Associated Press.

“Anyone found collaborating with the insurgents to bring harm or attack to the people of Malam Fatori will be cursed,” he said, adding that there are measures being put in place to fortify the town against future attacks.