Mumbai: A crude bomb was used for triggering the explosion at McDonalds Food Plaza at Mumbai Central station last week, according to a report submitted by forensic experts to the railway police on December 9.

"The report has confirmed the use of gun powder and iron nails in preparation of the crude bomb," a top railway police officer said.

"The report, which was submitted at around 6.30 pm, has confirmed our doubts about the use of a crude bomb in the explosion that injured 25 persons," the officer said.

The report has set to rest speculations about the explosion being triggered off by a faulty air-conditioning duct or leaking gas cylinder at the food plaza.

However, the police modified its statement to include the possibility of a crude bomb explosion after doctors recovered nails and splinters from the victims, who also suffered from serious burn injuries.

The food plaza had also issued a statement clarifying that its air-conditioning unit, its cylinders and other equipment were all intact, indicating that the blast had been set off through use of explosives.

PTI