DETROIT – For a city already struggling with high unemployment, widespread foreclosures and deep budget cuts, here was another crisis: wind-whipped fires tearing through row after row of homes, some of them abandoned.

The flames, probably sparked by downed power lines Tuesday evening, jumped from rooftop to rooftop, fed by winds up to 50 mph.

The fires swept though several neighborhoods across Detroit, including some that were well-tended and others filled with deteriorating vacant houses and weed-filled lots.

At least 85 structures were destroyed or scorched by the flames. Fire Commissioner James Mack said it was the worst spate of fires since the 1980s, when firefighters regularly battled hundreds of arsons on the night before Halloween.

No injuries were reported, but by Wednesday, people in some charred areas began complaining that firefighters took as much as 90 minutes to respond.

Mayor Dave Bing defended city crews, saying officials “can do all the planning in the world, but when something of this magnitude hits any city, you just have to respond.”

He called the fires a “natural disaster.”

The National Weather Service said a combination of dry air and high wind helped fuel the blazes over a four-hour period late Tuesday.

A day later, a thick odor of smoke hung over one northwest side neighborhood where four brick bungalow and Tudor-style homes were gutted. Two of the homes had only chimneys remaining. Neighbors and utility workers surveyed the damage, while the Red Cross counted displaced families.

Suspicion focused on power lines that were toppled by the wind. DTE Energy Co. said about 750 power lines were knocked down in the blustery weather. Company spokesman John Austerberry said the utility was investigating.

Two of the fires were regarded as arson, authorities said.

City Council President Charles Pugh said it was a “freakish day” because of the wind, and he played down complaints that the fire department was too poorly equipped to respond. Suburban departments reached out to help.

The department has about 500 firefighters, about 20 fewer than last year. The 236 on duty Tuesday is the typical number working each day.

Given another chance, Mack said, he might have called for help from the suburbs a little sooner.