BOSTON (CBS) — A Boston school was put on lockdown Tuesday morning as police investigated reports of a shooting nearby.

The Tobin School in Mission Hill was in safe mode for about twenty minutes as police searched the neighborhood after getting a call of shots fired on Smith Street around 9:45 a.m.

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The Maurice J. Tobin School in Boston. (WBZ-TV)

The Maurice J. Tobin School in Boston. (WBZ-TV)

Officers found no evidence of a shooting and no injuries were reported.

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A Boston Police K-9 unit looking for evidence of shots fired on Smith Street. (WBZ-TV)

A Boston Police K-9 unit looking for evidence of shots fired on Smith Street. (WBZ-TV)

Witnesses told police a possible suspect was seen in the area, wearing blue and black clothes.

The Tobin School, which has students from kindergarten to 8th grade, has returned to normal activities.

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No other information is available at this point in the investigation.