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LONGMONT - Longmont police, donning Hazmat gear, were investigating the death of a 6-year-old girl who died Monday morning.

Pollice say the girl, identified as Lluvia Espinoza Morales, went to the hospital with flu-like symptoms.

Longmont Police Commander Jeff Satur said investigators sealed one unit of a four-plex apartment in the 700 block of Darby Court where Morales lived.

Crews cleared the scene around 4 p.m. after investigators failed to find anything abnormal in air samples taken from inside. Investigators have ruled out carbon monoxide or a gas leak as a factor.

Satur said there there was no danger to the public.

Investigators say they put on Hazmat suits in an over abundance of caution.

"It seems almost overkill, but it's the only sure way of not cutting corners and if you cut corners, then you get somebody exposed and you really don't want to have that happen," Longmont Police Commander Tim Lewis said. "Our families go through enough in this career field, we don't want to expose them to stuff they could take home."

Smith said his department consulted with the Centers for Disease Control, the state health department and their Hazmat teams.

Investigators say a single mom lived here with her four daughters.

The cause and manner of death have not been determined and are pending further investigation by the Boulder County Coroner's Office.