UPDATE: The suspect was taken into custody at 4:07 p.m.
Police are on the scene of an hours-long standoff.
Around d 8:13 a.m. on Monday, a woman reported to security at the Stratosphere Casino-hotel that she had been assaulted.
Las Vegas Metropolitan Police Department officers arrived and attempted to make contact with the suspect near the 200 block of Philadelphia Avenue.
The suspect would not exit the building and SWAT was called around 1 p.m.
The scene is still active. The suspect has not surrendered.
13 Action News will post updates as they become available.