The coordinated shooting and bombing attacks which began on November 26, 2008 and lasted until November 29 saw the terrorists attacking Mumbai's landmarks like Chhatrapati Shivaji Terminus, the Oberoi Trident, the Taj Hotel, Leopold Cafe and Cama Hospital, among others.
PM Modi said "initially the world did not take us seriously" but is now coming to understand that terrorism is a major global threat. "The world will have to join hands to eliminate terrorism," he said.
"We salute all those brave women and men who lost their lives in the 26/11 attacks in Mumbai. Terrorism has become a global burden," PM Modi said in his monthly radio address.
India has maintained that the 26/11 Mumbai attacks were carried out by Pakistan-based terrorist group Lashkar-e-Taiba, whose chief Hafiz Saeed was released from prison by Pakistani authorities on Thursday, a move that drew strong criticism from the US.
Mumbai has seen many terror attacks; one of the deadliest ones was the 1993 Mumbai bombings that targeted the Bombay Stock Exchange and killed over 250 people.
In the 26/11 Mumbai terror attacks, Lashkar-e-Taiba operative Mohammed Ajmal Amir Kasab was the sole surviving gunman. He was one of the two gunmen who opened fire and threw hand grenades at Chhatrapati Shivaji Terminus, killing 52 people and injuring more than 100.
He was found guilty of a string of charges, including treason, waging war against India, murder and terrorist acts and sentenced to death by a Mumbai trial court in May 2010. He was hanged at Pune's Yerwada Jail.