By CBS3 Staff

PHILADELPHIA (CBS) – An underground transformer fire is caused power and traffic issues in Center City on Wednesday morning. Firefighters were called around 6:30 a.m. for a report of an underground transformer fire at SEPTA’s Walnut-Locust Station, near 16th and Walnut Streets.

It knocked out power to 130 customers and caused some traffic issues in the area of 16th and Walnut Streets.

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As of noon, only six customers remain without power.

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The fire is now out.

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The cause remains under investigation.