The blood-stained body of the woman, identified as C S Lama, was found near her room at Buddha Vihar in North Guwahati's Amingaon area this morning.
Police suspect that Lama, who was staying there for the last 25 years, was stabbed to death last night.
Sniffer dogs were pressed into service.
The dogs led the police to three persons living in the nearby village and they have been taken into custody.
Further investigations are on, police added.
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