AUSTIN (KXAN) -- San Marcos Consolidated Independent School District said there is no longer a threat to the San Marcos High School campus after it was previously on a "secure" lockdown, the district said on its website. Around 3:32 p.m., the San Marcos Police Department responded to the high school for a report of an active shooter, and the caller told dispatch they saw "a male with a gun in the hallway," the city of San Marcos said in a statement to KXAN. According to the district, it said a threat was made through an "anonymous phone call." Students were not allowed to be dismissed until the building was secure and given the all clear by SMPD. However, no shots were fired at the high school, and no injuries were reported, according to the city. Shortly before 4 p.m., the district said the high school was on lockdown Tuesday afternoon as a "precaution." By 4:40 p.m., the district said there was no longer an "active threat on campus." At 5:35 p.m., San Marcos police said the situation is all clear and there is no credible threat, but the investigation will continue. Students began dismissals at 5:30 p.m. The city said detectives continued investigating where the report came from, which includes "identifying the caller and any additional witnesses."