SAN ANTONIO — A fire led to an unwanted wake-up call for guests at a downtown hotel on the Riverwalk, the San Antonio Fire Department said, and a suspect was arrested later in the day. 

The incident took place around 2:30 a.m. Tuesday at Hotel Valencia on 100 East Houston Street.

Firefighters found a small fire in a utility closet on the second floor of the hotel that was quickly knocked down by the sprinkler system. According to court records, investigators reviewed security footage and found the suspect, 39-year-old Mario Saenz, in the storage closet and throwing cardboard on the fire to keep it growing. 

When authorities caught up to Saenz later in the day, he told them he had "done too much ice and believed that shadows were following him." An arrest affidavit states Saenz told investigators he used a light to start the fire in the closed, and admitted to throwing materials on it to make it stronger. He is now facing charges of arson. 

mario saenz arson suspect
Courtesy / SAPD

Authorities said the blaze caused minimal damage to the building.