Director General of Police P S Pasricha said the entire police force has been alerted following the blasts outside civil courts in Lucknow, Faizadbad and Varanasi in which at least four persons were killed.

Asked if any extra security would be placed at courts in the state, Pasricha denied of any specific instructions issued regarding security of court buildings as yet.

Alert sounded in Bihar

An alert was sounded in Bihar following serial blasts in Uttar Pradesh on Friday, a top police official said.

"We have issued an alert across the state immediately after receiving information about serial blasts at Varanasi, Lucknow and Faizabad in UP," Bihar Director General of Police Ashish Ranjan Sinha said.