As many as 166 people, including 26 foreigners, were gunned down during the dreaded attack Nov 26, 2008.
Film celebrities like Amitabh Bachchan, Madhur Bhandarkar and Anupam Kher took to Twitter to pay respects to those who lost their lives and to the bereaved as well as to salute the National Security Guard which fought valiantly to rid the attacked locations of the terrorists on the "unforgettable" day.
Here's what the celebrities have to say:
Amitabh Bachchan: Those horrifying hours of terror! Prayers and thoughts for those that lost lives...and saluting the force that fought!
Madhur Bhandarkar: The terror Mumbai witnessed 6 yrs ago on this day will never be forgotten. Also the innocent lives that were lost on that fateful night #26/11. This day is a reminder to us to always remain prepared, alert & do our bit in ensuring that Mumbai remains free from terror in future #26/11.
Anupam Kher: Today I remember the sacrifice of our martyrs and the deaths of so many innocent people. #Loss #Memories #Sacrifice #Prayers #26/11
Sonu Nigam: No words to offer prayers to the terror Mumbai and its martyrs experienced 6 years back today. Balvaano ko de de gyaan, Allah tero naam.
Arjun Kapoor: 6 years have passed...our prayers remain with each n everyone affected by that tragic event.
Farhan Akhtar: In remembrance of all who lost their lives and all who sacrificed their lives to save others on this day six years ago.
Dia Mirza: We will never and must not forget this day. May it inspire us to work towards a world of peace, harmony and justice. #26/11
Rahul Bose: Impossible to forget 26/11. Had just driven back home from Fort when I switched on the television. Thoughts today with bereaved families.
Ehsaan Noorani: In memory of those who perished on #26/11 and in memory of all those people harmed by #terrorism...love to the families.
Manoj Bajpayee: 26/11 it will always be unforgettable. prayers for the people Who lost their lives and salute to the police and NSG.
Ritesh Sidhwani: 26/11 Prayers for the ones we lost...Salute those who sacrificed their lives to save many more. Strength and courage to their families.
Tusshar: God bless the souls of our martyrs, who gave their lives and hence, gave us our city back!
Sophie Choudry: 26/11 #NeverForget what they did to Mumbai. #NeverForget the innocent victims. #NeverForget those who sacrificed themselves to keep us safe.
Kunal Kohli: 26/11 the most scary/sad days in my Mumbai's history.The handlers n planners are still free. Why? Need justice!
Subhash Ghai: To mark 26/11 today as POLICE DAY let one member of one family / society Go to our nearby police station to shake hand to one police man.
Shekhar Ravjiani: Saying a prayer for the martyrs and the victims of the 26/11 attacks...the memory of which still causes pain to the lives affected by it.