As many as 12 people were hurt when firecrackers ignited hydrogen-filled balloons, causing a massive explosion during a birthday celebration for India’s prime minister, dramatic video shows.

The fiery footage shows the moment when about 100 balloons burst into flames during a birthday gathering in Chennai on Friday for Indian Prime Minister Narenda Modi, who turned 70 on Thursday, the New Indian Express reported.

A huge explosion is seen seconds after a series of firecrackers went off nearby, sending sparks into a bunch of balloons and causing it to ignite instantly, the newspaper reported.

Dozens of people were standing beneath the balloons when they went up in a spectacular fireball, the clip shows. Several people are then seen trying to put out several small fires while a boy rides his bike away from the scene in tears.

The organizers, who were from Modi’s political party, were planning to release up to 2,000 of the gas-filled balloons into the air during the celebration but did not get permission from police in advance of the display, according to the newspaper.

All of the balloons “exploded” when a spark from the firecrackers came into contact with them, a police officer told the newspaper.

About 12 people were burned in the incident and were taken to the hospital with minor burns, according to the report.