ISTANBUL, Jan 1 (Reuters) - Commercial shipping was closed in both directions on Turkey's Dardanelles Strait on Monday due to heavy fog, state broadcaster TRT reported, citing authorities.

The vessel traffic agency halted shipping at 2 a.m. (2300 GMT Sunday), it said. The strait connects the Marmara and Aegean seas and is the route for Black Sea commodities exports to world markets.

(Reporting by Jonathan Spicer and Azra Ceylan; Editing by Kim Coghill)