Gunmen stormed a police station in south-east Nigeria and freed prisoners, a day after the region was hit by a prison breakout blamed on separatists, police said on Wednesday.
The police station in the town of Ehime Mbano in Imo state was set ablaze on Tuesday after it was raided by gunmen, police spokesman Orlando Ikeokwu said.
"I can confirm to you that another police facility was attacked by bandits," Mr Ikeokwu told AFP.
He said three vehicles were burnt, but did not say if there were casualties.
Local media said some detainees were freed by the gunmen.
South-east Nigeria is experiencing an upsurge in attacks aimed at security forces in violence that officials blame on the Indigenous People of Biafra, a separatist group seeking independence for the indigenous Igbo people.
The attack came a day after a prison and the police headquarters in Imo's state capital Owerri were attacked and 1,844 inmates freed.
The armed forces said on Wednesday a joint operation was under way in the volatile region "to flush out the miscreants".
Vice President Yemi Osinbajo visited the state on Tuesday to assess the damage in Owerri.
"Anyone who perpetrates violence does not represent the progressive-mindedness of the good people of this state and this zone," Mr Osinbajo said.
"I call on all of us to come together to resist any attempt to turn the progress and peace that this zone is set to experience to conflict and disruption."
The Indigenous People of Biafra denied the accusations but the police declared a clampdown on the group.
Calls for a separate state of Biafra in the south are a sensitive subject in Nigeria, after a unilateral declaration of independence in 1967 sparked a brutal 30-month civil war.