HOUSTON -

Two suspects are in custody after a SWAT standoff at a cell phone store in northeast Houston.

Police say it all started around 9:15 a.m. on Friday when two panic alarms were set off at a business next door to the Boost Mobile on N. Wayside Drive.

SWAT responded to the scene and police set up a perimeter that lasted nearly three hours.

"I just saw the (suspects) run into the store," witness Latanyia Powell said. "Police came from everywhere and I just froze up. I was scared."

According to police, at least one of the two suspects was carrying a revolver.

All the employees were able to escape the store unharmed.  One of the suspects surrendered to police almost immediately; however, officers lost sight of the second suspect.

"The suspect wasn't inside (the store)," Houston Police Department spokesperson Jodi Silva said.  "But (officers) had evidence that he'd climbed up into the attic space."

Members of the SWAT team climbed on top of the roof in pursuit.  According to police, the 25-year- old suspect surrendered atop the roof and told officers he was injured after falling inside attic.

Because of his injured shoulder and leg, Houston firefighters and SWAT members had to use a HFD ladder to bring the suspect down.

There were no reports of shots fired or injuries.