Peshawar: At least 22 people were killed and 40 others injured in Peshawar when a motorcycle-borne Taliban suicide bomber blew himself up at the gate of a crowded government office on Tuesday, in one of the deadliest attacks in northwest Pakistan since army school massacre that left over 150 dead.

The bomber blew himself up when a security guard stopped him outside the National Database and Registration Authority (Nadra) office that regulates government databases and manages the sensitive registration database of Pakistan citizens in Mardan town of Khyber-Pakhtunkhwa, officials said.