Five cars were damaged yesterday morning in three separate arson cases in Boston’s Allston neighborhood, according to a Fire Department official.

“We have ruled this as arson,’’ said Steve MacDonald, a Boston Fire Department spokesman.

He said the cars were parked in driveways along Ashford and Pratt streets.

“This area has been hit with suspicious vehicle fires for the past month and a half,’’ MacDonald said. A total of eight car fires have occurred in Allston during the period, he said.

No one was injured in yesterday’s fires or in the previous car fires, MacDonald said.

The department received the first call yesterday at about 7:50 a.m. for a car fire at 24 Pratt St. Two cars parked next to each other were fully engulfed, with damage extending to a third car, MacDonald said.

After firefighters put out that fire, another fire was reported at the rear of 33 Pratt St., he said.

A third car fire was then found at the rear of 28 Ashford St. MacDonald said the last two fires were between 9 and 10 a.m.

He said that in August, fire from a car on Ashford Street extended to a nearby house. No one in the house was injured.

The fires are under investigation. No arrests have been made.

The Boston Fire Department urges anyone with information to contact investigators at 617-343-3324.

Miriam Valverde can be reached at mvalverde@globe.com.

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