Eight people were killed when a gunman described as mentally unbalanced opened fire inside a mosque in a village north of the Yemeni capital during Friday prayers, an official said. "A man opened fire on worshippers in a mosque in the village of Kahal" 100 kilometres or 62 miles north of Sanaa, killing eight people and wounding nine others, the official said. An earlier toll said five people were killed in the attack -- the second in a month on a mosque in Yemen -- and 12 wounded, 10 seriously. However the official Saba news agency gave a lower death toll, saying seven people were killed in the attack and that of 11 people wounded, three were in a serious condition. Saba identified the suspect as Abdullah Saleh Zaid al-Qahali, 24, and said that he had been arrested and was being questioned about the attack. The official said that the suspect "is believed to be mentally unbalanced."