Birthday balloons explode blowing up Maruti Esteem car in Delhi

He said, helium gas is considered safe, but normally in birthday balloons, hydrogen gas is filled as it is inexpensive.

Automobile expert Tutu Dhawan agreed with this view, adding that nowadays vehicles are closed from all sides and a minor spark can cause blast in balloons.

A report has been filed in Vijay Vihar police station and police is investigating.