UPDATED: Firefighters Knock Down Second-Alarm Fire

The following was updated at 8:51 a.m. Thursday. 

Firefighters from three area communities extinguished a fire at an eight-unit condominium complex in Portsmouth Wednesday night. Six of the units were evacuated due to the fire. 

Portsmouth firefighters received a 911 phone call at 8:49 p.m., reporting a kitchen fire at 27 Lawton Brook Lane. 

The Portsmouth Fire Department received a second 911 call was made from 26 Lawton Brook Lane, reporting that this unit was filling with smoke.

Both 27 and 26 Lawton Brook Lane are part of single structure that houses eight condominium units. Six of the units, which were occupied by residents, were evacuated. 

Crews, led by Captain Howard Tighe, arrived to find a fire in the kitchen and “heavy black smoke” throughout the residence. 

"Because of the fire extending up to the second floor, they struck a second alarm," said Portsmouth Fire Deputy Chief Michael O'Brien. "The fire was quickly knocked down." 

Crews from the Middletown and Bristol Fire Departments were called to the scene to assist. The Tiverton Fire Department covered the Portsmouth fire station. 

"We have high levels of carbon monoxide in all of the units at this time," O'Brien said. "We're going through and ventilating all of the structures." 

Fire crews ventilated all units of the complex. 

All of the residents returned to their homes, except a man and a woman who reportedly stayed with family for the night. No injuries were reported. 

The cause of the fire remains under investigation, but appears to have started in the kitchen. "It seems to be a cooking mishap," O'Brien said. 

National Grid was also called to the scene. 

"I would like commend Captain Tighe and his firefighters for their work; their aggressive attack on the fire prevented this incident from becoming a major incident," O'Brien said.

"The fact that, with the exception of the unit that caught fire, all residents were back in their homes after less than two hours is a testament to their outstanding response."