At least 18 people were killed in a suspected Boko Haram attack Cameroon's northern city of Mora, near the Nigerian border on Friday.Mindjiyawa Bakary, Governor of Cameroon's Far North region, said that the attack took place at around 0900 GMT in a crowded market in Mora.Bakary said that it may have been a twin suicide attack, but details have not been confirmed and the death toll may rise.No group has claimed responsibility for the attack but such assaults have generally been attributed to Boko Haram.Less than two weeks ago a female suicide bomber blew herself up in Cameroon's northern city of Nguetchewe near the Nigerian border, killing at least 11 people.More than 1,100 civilians and security force members have been killed in attacks attributed to Boko Haram in the Far North since 2013, according to Communication Minister Issa Tchiroma Bakary.Cameroon has reinforced its military presence along its border with Nigeria, trying to repel the Nigerian militant group with the help of the local population.