Lalit Mohan Jha, the alleged mastermind behind the December 13 Parliament security breach, was arrested on Thursday after he turned himself in to the Police, following a manhunt. Accompanied by an accomplice, Jha is linked to the dramatic breach where individuals released smoke and slogans in the Lok Sabha. Jha, a former teacher in Kolkata, had a low profile. He was briefly associated with an NGO. The arrest suggests a breakthrough in the security breach, exposing vulnerabilities in Parliament's security.