Seven residents suffered non-life-threatening injuries in a fire that broke out in a three-story home on Ash Street in Waltham early Wednesday morning.

The fire started at approximately 3 a.m. and, according to WBZ-TV’s Sera Congi, residents were running out of the building when firefighters arrived. The owner of the building said that all three families that lived there were able to escape, but that seven suffered from minor injuries. Congi’s report added that most of the victims were treated for smoke inhalation.

By 5 a.m., the blaze was under control, but Congi reported that firefighters claimed to have issues with water pressure and struggled working in what they described as a narrow street. According to WCVB’s Antoinette Antonio, nearby trees and power lines were also problematic for fire crews.

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The Red Cross is expected to help all 22 residents displaced by the blaze, including the seven who were injured.

The cause of the fire remains under investigation.