Dozens of worshippers have been killed after gunmen opened fire and detonated explosives at a Catholic church in southwestern Nigeria on Sunday.

       The attackers targeted the St Francis Catholic Church in Ondo state just as the worshippers gathered on Pentecost Sunday, legislator Ogunmolasuyi Oluwole said.

       Among the dead were many children, he added.

       The presiding priest was abducted as well, said Adelegbe Timileyin, who represents the Owo area in Nigeria’s lower legislative chamber.

       “Our hearts are heavy,” Ondo governor Rotimi Akeredolu said on Sunday. “Our peace and tranquillity have been attacked by the enemies of the people.”

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       Shoes and personal belongings lie on the blood-soaked floor following the deadly attack

       (AP)

       Authorities did not immediately release an official death toll but Mr Timileyin said at least 50 people had been killed, though others put the figure higher.

       Videos appearing to be from the scene of the attack showed church worshippers lying in pools of blood while people around them wailed.

       Nigerian president Muhammadu Buhari said “only fiends from the nether region could have conceived and carried out such dastardly act”, according to a statement from his spokesperson.

       “No matter what, this country shall never give in to evil and wicked people, and darkness will never overcome light. Nigeria will eventually win,” said Mr Buhari, who was elected after vowing to end Nigeria’s prolonged security crisis.

       In Rome, Pope Francis responded to news of the attack.

       “The pope has learnt of the attack on the church in Ondo, Nigeria and the deaths of dozens of worshippers, many children, during the celebration of Pentecost.

       The attackers targeted the St. Francis Catholic Church in Ondo state just as the worshippers gathered on Pentecost Sunday

       (AP)

       “While the details are being clarified, Pope Francis prays for the victims and the country, painfully affected at a time of celebration, and entrusts them both to the Lord so that he may send his spirit to console them,” a statement issued by the Vatican press office said.

       It was not immediately clear who was behind the attack on the church.

       While much of Nigeria has struggled with security issues, Ondo is widely known as one of Nigeria’s most peaceful states.

       The state, though, has been caught up in a rising violent conflict between farmers and herders.

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       “In the history of Owo, we have never experienced such an ugly incident,” said lawmaker Oluwole. “This is too much.”

       Nigeria’s security forces did not immediately respond to questions about how the attack occurred or if there are any leads about suspects.