Five nuns were abducted by gunmen in Nigeria's Delta state on Thursday, according to local media.

The nuns are members of the Order of the Missionary of Martha and Mary.

They were kidnapped Oct. 25 while returning from a burial. They were taken near Agbor, about 25 miles west of Issele-Uku.

The religious women were in a vehicle which the kidnappers shot at. Along with the five abductees, another two nuns were injured.

At least five priests have been kidnapped in Delta state this year.

Violence against Christians has significantly increased in Nigeria in recent years, with the Islamist terror group Boko Haram threatening safety in the north, and smaller violent gangs threatening security in the south.