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.

READ MORE: New Push In North Texas For Pregnant Women To Get The COVID-19 Vaccine

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.

READ MORE: Frisco ISD First In North Texas To Offer Online Learning In Wake Of Rise In COVID-19 Cases

Oncor personnel are standing by until the smoke clears.

Nearby buildings have been checked for smoke.

No injuries have been reported.

MORE NEWS: Fans Flock To Dallas' Fair Park For 'Wicked,' First Broadway Tour Since Pandemic Began