UPDATE: TFD says lithium batteries from scooters probable cause of Midtown fire

UPDATE: 3 p.m. May 30

Tucson Fire has said in an email that the probable cause of the fire were lithium ion batteries from electric scooters stored outside of one of the homes.

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UPDATE: 10 a.m., May 30

Fifty-two firefighters battled yesterday's midtown blaze, according to a social media post from Tucson Fire.

Crews responded to the fire in the 3300 block of East Bellevue Street, at around 4:24 p.m. At that time, only one house was on fire, but it quickly spread to a neighboring home.

The fire spread to the attic of the second home, making containment difficult, the post said. Crews transitioned to an exterior fire attack, due to a potential roof collapse.

The fire was brought under control in 50 minutes. No crew members were injured. The cause of the fire is under investigation.

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A large amount of smoke is visible on East Bellevue Street near North Jones Boulevard, where a house fire spread to a second house Wednesday afternoon, according to Tucson Fire Department.

TFD Captain Paul Moore tells KGUN 9's reporter on the scene Tina Giuliano a total of seven people were told to leave the houses. Two people were sent to the hospital, and are in stable condition.

Fire crews ask that you avoid the area, located just north of Speedway between Country Club and Alvernon.

The cause of the fire is under investigation.