Big B unveils book authored by cop

Megastar Amitabh Bachchan launched a book titled "Quantum Siege", penned by Brijesh Singh, additional commissioner of police North Mumbai, here.

"Released a book written by a Police officer of the rank of Asst Commissioner, Brijesh Singh ... from minding to binding !!" tweeted Amitabh Saturday.

Prior to that, he was busy shooting for his cameo role in "Ghoomketu", which is directed by Pushpendra Mishra and features Nawazuddin Siddiqui as the protagonist.

"That done it is a quick drive of an hour, a change of dress, a hurried drive across to the Marriott and the book release of 'Quantum Siege' written by a police officer, here in Mumbai," he posted on his blog http://srbachchan.tumblr.com.