Heroin, smuggled from Myanmar, worth over Rs 6.40 crore was seized and three persons were arrested in two separate operations by the police personnel in Assam and Arunachal Pradesh on Friday, officials said.

Police officials said that 691 gm of heroin worth over Rs 5.50 crore was seized and two drug peddlers identified as Sandeep Singh and Manoj Deka were arrested in Guwahati city.