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BUFFALO, NY-- Buffalo Police responded to a report of a person with a gun on the grounds of Harvey Austin Elementary School Thursday afternoon. The school on Sycamore Street was put into lockdown mode as police searched the school and the surrounding area. At least 20 police vehicles responded to the scene.

According to Buffalo Police spokesman Mike DeGeorge, officers conducted a thorough search of the school and didn't find anything suspicious. Erie County Air One was nearby and made a sweep of the school's roof as K9 units searched inside. SWAT was called out.

The incident began when an anonymous call came in to the school office at about 4:15 p.m. saying a person bearing a weapon was on or near school property, according to a Buffalo Public Schools spokesperson.

Police said about 60 students were in the school at the time.

Later, DeGeorge told 2 On Your Side that a man regularly involved in after-school activities is believed to be the person who was seen with a gun. "What I can say is that the individual did have a handgun, with him, police believe that this is a teacher who works in an after-school program, and is a regular at the school."

On Thursday at about 10 p.m., Buffalo police released a statement saying that Dwayne Ferguson, 52, of Buffalo had been arrested for carrying a loaded handgun on school grounds.