Anees Pasha, Tseen Nawaz and Shahid Salman Khan were arrested under IPC section 153 (A) (spreading enmity among various communities) by spreading rumours through email and SMS, Police Commissioner Jyotiprakash Mirji told reporters here.
Police seized four mobile phones, two computers and a laptop from their possession, Mirji said.
So far 15 cases had been registered in connection with the rumour mongering, which led to around 28,000 people from the North East region leaving the city in the past three days, he said adding some more arrests would be made in coming days.
Karnataka DGP Lalrokhuma Pachau, who hails from Mizoram where he had served as the police chief, said he had spoken to officials of seven North Eastern states and apprised them of the safety and security of their community in the state.
Pachau said barring some minor incidents "The situation is normal in the state".
As many as 300 northeast people left the city in a regular train which departed from Yeshwanthpur to Howrah, Mirji said.
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"Six-hundred CRPF and RAF personnel have been deployed in various sensitive areas," he added.
He also said they have held several peace committee meetings with several communities.
The police also intensified night patrolling with extra forces keeping vigil even after 2 am, he said.