MAZAR-I-SHARIF (AFP/Reu-ters) - A suicide bomber killed up to eight people as they returned from prayers at a mosque in north Afghanistan Sunday, the first day of Eidul Azha, officials said. The bomber attacked soon after the Eid prayers had finished, ministry spokesman Siddiq Siddiqui said. We strongly condemn this. This is yet another act of violence against civilians, on this important day, he said. Most of the dead were civilians and at least 20 other people were thought to have been wounded in the attack in the city of Baghlan at around 9:30am (0500 GMT). The blast came two days after Afghan Taliban leader Mullah Omar urged his fighters to avoid civilian casualties in the decade-long Afghan war. Eight people were killed including two commanders of Afghan militia forces. The rest were civilians, said Amir Gul, a local government official. Other officials gave varying death tolls. Siddiqui in Kabul put the death toll at seven, with 15 wounded, while Baghlan police chief Asadullah Shirzad said the figure was six including one police officer. Siddiqui said there were two suicide bombers involved, one of whom detonated himself and caused the casualties, while the other was arrested by police before he could blow himself up. The suicide bomber who blew himself up was on foot. A doctor at the main hospital in Baghlan said 20 wounded people had been admitted. The attack happened on the first day of Eidul Azha in Afghanistan, which is traditionally a time for people to pray and spend time with their family and friends. The Taliban were not contactable to comment on the attack but Siddiqui said that initial indications suggested the insurgents were behind the attack. Previously seen as relatively stable, Baghlan has seen an uptick in militant attacks in recent years. On Friday, the Taliban published a statement on their website attributed to Mullah Omar calling on fighters to take every step to protect the lives and wealth of ordinary people.