A suicide bomber drove a vehicle packed with explosives into a Catholic church in northern Nigeria, killing at least eight people and injuring 100.
The bombing led to reprisal attacks that killed at least two more people, police said.
The bomber drove a jeep inside the packed St Rita's church, in the Malali area of Kaduna, a volatile ethnically and religiously mixed city.
There was no immediate claim of responsibility but Islamist group Boko Haram has claimed similar attacks in the past.
It has attacked several churches with bombs and guns since it intensified its campaign against Christians in the past year.
Shortly after the blast, angry Christian youths took to the streets armed with sticks and knives.
A Reuters reporter saw two bodies on the roadside lying in pools of blood.
A bomb in a church in Kaduna state in June triggered a week of sectarian violence that killed at least 90 people.