Sunil Kumar, 25, an executive at the centre, had come to invite his colleagues to a party after his son's birth but was attacked by Mukesh who was at loggerheads with him.
Medical representative Ram Avtar, 32, and Sunil's cousin Devender, 30, died after being hit by sharp weapons by Mukesh and his friends.
Sunil, along with another person Sanjay, suffered grievous injuries. Both are stated to be in a critical condition.
The assailants are on the run. "We are questioning a few people," said a police officer. CCTV footage of the centre and its adjoining companies was being examined.
--IANS (Posted on 05-10-2013)