Update 9:32 p.m.- Oncor said the transformer underground malfunctioned. Everything is fixed and no power is out.

DALLAS (CBSDFW.COM) – The Dallas Fire-Rescue responded to an explosion near 315 South Cesar Chavez Boulevard.

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The explosion sent black smoke into the immediate area in Downtown Dallas.

Firefighters said an unknown malfunction in an underground electrical vault caused the explosion and sent a column of black smoke into the air.

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Oncor personnel are standing by until the smoke clears.

Nearby buildings have been checked for smoke.

No injuries have been reported.

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