A cattle trader, who was among the 30 people who fell unconscious after eating breakfast at a restaurant in Rajshahi, died yesterday.

The dead is Jaj Mia, 40, of Foilshakhali village in Narsingdi, said police.

The cause of the death can be ascertained after an autopsy, said Brig Gen ASM Rafikul Islam, director of Rajshahi Medical College Hospital.

Some 30 cattle traders and truck drivers and helpers from different parts of the country went to City Bypass Haat area on the outskirts of Rajshahi city to buy cattle ahead of Eid.

They fell unconscious after eating breakfast at a roadside eatery belonging to one Zafar Ali on Sunday morning.

The food items were not stale, said Mizanur Rahman, assistant professor of the medicine department of RMCH, adding that something was mixed with the food, which caused their illness. The restaurant owner's son Faisal Hossain and three other staff were arrested in this connection and sent to jail, said police.