"We are alert. We have sounded an alert all over the country," Union Minister of State for Home, Hansraj Ahir told reporters here.
He said the Uttar Pradesh Police was doing a commendable job to nab the terrorist holed up in a house in Kakori area in the outskirts of Lucknow.
"Terrorists do not have any ideology and create disturbances whenever they get a chance. The police is on the job to nab such elements," he said.
The densely populated neighbourhood has been cordoned off and at least 20 commandos are involved in the operation, police said.
At least eight persons were today injured, two of them seriously, in a blast in the Bhopal-Ujjain passenger train near Jabdi station in Shajapur district of Madhya Pradesh, a Railway official said.