The bomber entered the uncompleted Redeemed Christian Church of God on Sunday, in the Jigawa area on the outskirts of the city, and detonated his explosives, killing the worshippers, including a woman and her two children as well as the pastor.
"Four worshippers died instantly while the fifth victim gave up shortly after she was taken to hospital," a police officer involved in the evacuation told the AFP news agency.
"The victims included a woman and her two children, the pastor and another worshipper," added the officer who spoke on condition of anonymity.
Garba Manu told AFP the bomber arrived at the church on a motorised rickshaw disguised as a worshipper and detonated his explosives as soon as he entered the church.
"I saw when the bomber alighting from a motorised rickshaw and entering the church and as soon as he entered a loud explosion ripped through the church which is under construction," he said.
"I saw him walked into the church and he didn't raise any suspicion.
"Five worshippers, including three females and two males were in the church when the bomber entered and they were all killed...