Expressing deep concern, the president called upon people to maintain calm and restraint.
"The nation must remain united in its firm resolve to fight against all forms of terror and violence which have no place in a civilised society," he said.
The prime minister spoke to Bihar Chief Minister Nitish Kumar on telephone and called for immediate and firm action.
"He called for urgent steps to identify and take action against those responsible. He also assured the chief minister of all central assistance in the investigations," the Prime Minister Office's said in an official statement.
At least five people were killed and more than 70 injured as seven bombs exploded in Patna Sunday, six of them in and around the ground where BJP's prime minister candidate Narendra Modi, hours later, addressed a rally.
--IANS (Posted on 27-10-2013)