One person was arrested.
Police arrested jeweller Ratan Sarkar who threw acid on a vegetable vendor and others Saturday night in North Tripura district's Kailashahar town, 175 km from here.
The jeweller had a quarrel with the vendor over the use of space in front of his shop.
Following the argument, he threw nitric acid on the vendor and on the on-lookers who had gathered near the shop, a police spokesman said.
The injured were shifted to hospital, where the condition of four was stated to be critical.
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