WARNING, GRAPHIC: At Least 50 Massacred Inside Nigerian Church By Muslim Extremists

LAGOS, June 5 (Reuters) - Gunmen attacked a Catholic church in southwest Nigeria during mass on Sunday, killing at least 50 people including women and children, according to a hospital doctor and media reports.

The gunmen shot at people outside and inside the church building, killing and injuries worshippers, said Funmilayo Ibukun Odunlami, police spokesperson for Ondo state.

She did not say how many people were killed or injured at St Francis Catholic Church in the town of Owo but added police were investigating the cause of the attack.

Ikwu said the bishop and priests from the parish had survived the attack unharmed.

A doctor at a hospital in Owo told Reuters that at least 50 bodies had been brought into two hospitals in the town from the attack. The doctor, who declined to be named because he is not authorised to speak to the press, also said there was a need for blood donations to treat the injured.

Nigeria is battling an Islamist insurgency in the northeast and armed gangs who carry out attacks and kidnappings for ransom, mostly in the northwest.