"Goa Police has detained one person last night. The interrogation is on," Chief Minister Laxmikant Parsekar, who also holds the Home portfolio, told reporters on the sidelines of an event here today without divulging further details.
According to police sources, two more persons--a Yemenese and a Nigerian--have been detained from a casino in Baga and are being quizzed by ATS, which is probing the case.
Sources said that Calangute police is also interrogating them. The trio were overstaying here after expiry of their visa.
The threat letter, purportedly signed by ISIS, was received by the State Secretariat on January 13.