Besides Sangakkara, former Lankan cricketer Mahela Jayawardena also condemned the terror attack.
Gambhir played cricket for India between 2004 and 2016 when he last played in a Test match against England.
The Bangladesh players returned home yesterday night.
"We were so scared and we started crying inside the bus."
The India opener took to Twitter to express his sadness over the turn of events.
"I condemn it firmly."