A power outage in Burlingame, blamed on a hazmat spill, has affected a major downtown shopping district and surrounding neighborhoods for days, authorities said.

On Wednesday, Pacific Gas and Electric indicated on an outage map that power was out to about 930 customers in the busy Broadway Burlingame retail district, as well as the Burlingame Gate, Burlingame Terrace, and Burlingame Gardens neighborhoods. 

Burlingame police said Broadway was closed between Chula Vista and Carolan avenues in the area of California Avenue and the Broadway Caltrain station.

Earlier Wednesday, the Central County Fire Department said its crews were called out to the area to check on a possible gas leak. A PG&E spokesperson said that the outages were caused when a third-party source leaked a substance into electric vaults in the area. 

"A petroleum product from a third-party source – not PG&E – is intruding into electric vaults in Burlingame," said spokesperson Tamar Sarkissian in a prepared statement on Thursday. "None of our equipment uses or contains that product. We are currently testing the petroleum product to learn more."

There have been a series of outages in downtown Burlingame over the last several days, according to business owners. Sarkissian said Thursday that the outages began on Tuesday, and as PG&E crews inspected the equipment related to the outages, they detected the hazardous substance and notified first responders. 

"Out of an abundance of caution, PG&E worked to de-energize equipment yesterday and has installed 14 generators to provide power to the 127 customers that were impacted by this situation," Sarkissian said. 

A hazmat crew contracted by PG&E has been at the site since Wednesday to remove the petroleum product from the vault, Sarkissian said, adding that the utility was working with local and state officials to determine the source of the substance.

Sarkissian did not identify the third party involved.

PG&E originally indicated the estimated time of power restoration was 6 p.m. Wednesday, but while most of the outages in the area were restored, power was still out in the area around the Broadway and California Drive intersection on Thursday morning. The estimated restoration time was listed at 1 p.m. Thursday, but as of 3 p.m., the power was still out, according to the PG&E outage map.