The manhunt for Christopher Dorner led LAPD SWAT officers to a Northridge Lowe's home improvement store after people reported seeing someone who resembled the fugitive former police officer there.

LAPD swarmed the store off Nordhoff Street about 5 p.m. Customers were escorted out of the store as police looked for any signs of Dorner.

LAPD stressed that it was an unconfirmed sighting.

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[Updated 7:27 p.m.: A law enforcement source said the call to the Lowe's might have been related to a couple fighting outside the store].

There have been several reports similar to this one in recent days that didn't pan out.

The search came several hours after the LAPD issued a tactical alert as it handled the Dorner manhunt as well as security for the Grammys.

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The LAPD did not detail its Grammy security arrangements, but the department regularly sends a large contingent of officers to awards shows.

This year, the Grammys occurred on the fifth day of a manhunt for Dorner, who is suspected of killing an Irvine couple and a Riverside police officer.

The tactical alert came the same day that Los Angeles Mayor Antonio Villaraigosa announced a $1-million reward for information leading to Dorner's capture.

TIMELINE: Manhunt for ex-LAPD officer

“We will not tolerate anyone undermining the security of this community,” Villaraigosa said at a news conference at LAPD headquarters downtown. “We will not tolerate this reign of terror.”