MINNEAPOLIS (WCCO) — Authorities suspect the fire that destroyed part of a Waseca baseball field earlier this month was started purposefully.

Firefighters responded to flames at Tink Larson Field around 8 p.m. on April 6. They spent an hour and a half trying to suppress the fire, which ultimately burned down the concession stand and grandstand.

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The field was built in 1939 and renamed after Tink Larson, a legendary high school baseball figure in Minnesota, in 1994.

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The State Fire Marshal Division and Waseca Police Department ask the public to call the Minnesota Arson Hotline at 1-800-723-2020 with any information about the fire.

The Minnesota Chapter of the International Association of Arson Investigators and the city of Waseca are each offering a reward of $5,000 for information leading to the arrest of the suspected arsonist.

Authorities recently spoke to a man seen at the field the night of the fire, but released him and absolved him of suspicion.

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Though authorities suspect arson, the investigation is ongoing. Authorities are still identifying and interviewing individuals seen near the field the night of the fire.