A call was received around 9.56 PM yesterday about a cylinder blast in a tea stall near the shanties, said a senior officer from the Delhi Fire Services.
The fire engulfed two shanties located near the tea stall. Four fire tenders were rushed to the spot and the blaze was brought under control by 10.59 PM, he said.
All the injured persons were rushed to the ESI and Safdarjung hospitals. While one of the injured was discharged after treatment, three persons are in a critical state, police said.