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An elementary school in the Silver Lake area was on lockdown Wednesday as officers investigated a report of a suspicious person who may have been armed, police said.

Police were sent to Allesandro Elementary School in the 2200 block of Riverside Drive (map) after a 911 call from a pre-paid cellphone came in just after 8 a.m. reporting “armed suspects” in the area, according to Officer Sally Madera of the Los Angeles Police Department.

Police tried calling the person who made the report back, but there was no answer, Madera said.

The school was not initially placed on lockdown, but was later locked down as authorities searched the building for any suspicious activity, according to Madera.

Aerial video from Sky5 showed several patrol cars and officers outside the elementary school.

Students were safe in their classrooms and continuing instruction during the investigation, according to a tweet from the Los Angeles School Police Department.

Authorities were unable to find anything suspicious and the lockdown was lifted a little after 10 a.m., according to Officer Drake Madison.

Pre-kindergarten dismissals were set to be on time in the morning, and Riverside Drive was expected to reopen to traffic soon, the school Police Department said on Twitter at about 10:15 a.m.

A similar incident involving a 911 call from a pre-paid phone card took place Tuesday involving different schools, according to Madera.