An explosion in a Beirut suburb killed Lebanon's top anti-terror investigating officer and his driver Friday, sources with the Lebanese Internal Security Forces and a government minister told CNN.

"It was a powerful blast," CNN's Anthony Mills said. "I was less than half a mile away when it occurred and I felt the shock waves in the car I was traveling in.

"I arrived on the scene several minutes later and there was widespread damage -- several vehicles that had been reduced to hulks of burning, twisted metal ... debris scattered over a wide area."

The explosion killed Capt. Wissam Eid, the sources said. Civilians may have also been killed, the sources said, but the full casualty toll was not immediately available.

Hazmiyeh is a Christian neighborhood northeast of the capital.

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