New Delhi (CNN Business) The head of India's biggest coffee chain has gone missing.

Coffee Day Enterprises, the company that owns the Café Coffee Day chain, said on Tuesday that its chairman, V.G. Siddhartha, had "not been reachable" since the previous evening.

Indian police believe Siddhartha left the southern Indian city of Bangalore on Monday and traveled by car to Mangalore in Karnataka state, Mangalore police commissioner Sandeep Patil told CNN Business.

Patil said police believe the executive left his car to walk on a bridge over the Netravati river, near where it flows into the Arabian Sea. The coast guard and local fishermen were searching the river, he added.

Police at the Netravati river in Mangalore, southern India, as search teams look for Indian coffee tycoon V.G. Siddhartha.

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