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"At least two people have been killed and a number of others injured in an explosion in the southern suburbs" of Beirut where the Shiite Hezbollah movement has its headquarters, the official said.
"The cause of the explosion has not yet been determined."
Earlier the official national news agency NNA said the blast could have been aimed at a member of the Palestinian Hamas movement in Lebanon.
The blast was "the result of three bombs placed under a car whose owner is said to be a member of Hamas," the agency said, adding that two people were wounded in the explosion.
But in a terse report, quoting unnamed security officials, Hezbollah's Manar television said the "blast took place in an office of the Hamas movement causing casualties." It did not give further details.