"Terrorist bombing on Budaya Street damages multiple cars without casualties," read a tweet by the interior ministry.
No further details were available.
Bahrain has been rocked by unrest since Shiite-led protests in 2011 were put down by authorities in the Sunni-ruled Gulf state.
The country, ruled by the Al-Khalifa dynasty for more than two centuries, has a majority Shiite population which has long complained of marginalisation.
Bahrain last month executed three men found guilty of killing policemen, including an Emirati officer who was part of a Gulf force that entered the kingdom to help quell protests.
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