New Haven fire and police officials said they are investigating several fires, three of which were deemed suspicious.
According to fire officials, five Yale University students were forced out of three separate houses at 401, 397 and 395 Crown St.
Crown Street was closed at Park Street.
The flames broke out around 3 a.m.
"I've only been here for less than a month and its been an exciting month already," said David Ribot, a Yale student.
Investigators said the fires appeared suspicious because pour patterns were discovered.
The people who were forced to evacuate were Yale students, some of which were fraternity members. None of them were hurt. They should be able to return home later in the day because the damage was very minor.
Ribot said he's the president of Yale's Alpha Epsilon Pi fraternity, which rents one of the affected homes on Crown Street. He said another brother woke him up.
"[I] came down stairs and found a couple of firefighters in my living room, bashing in the wall to get to the rest of the fire, make sure everything is put out," he said.
The two other houses next door also had been set on fire, according to investigators. They said they brought in a state police dog to sniff for accelerants.
"Anytime these is something like that, we bring him out, another tool we can use to determine the origin," said Fire Marshal Robert Doyle, New Haven Fire Department.
Ribot said he and his fraternity brothers are already making other plans.
"We had some events planned for the weekend, but likely have to be postponed or relocated," he said.
Yale Senior Brian Clark said he and his roommates had no clue their Crown Street home was on fire until they stepped outside to see the melted siding and the charring stretch up the side of the apartment.
"We noticed the fire trucks, sirens, lights outside, saw some firemen going into the house next door," Clark said. "Everything seemed fine in our house, we didn't see any smoke and then we got a knock on the door and realized the students next door had extinguished the fire on the corner of our house that we didn't even realize was here."
The Crown Street fires contributed to what turned out to be a long night for New Haven firefighters.
Another fire on Fairfield Street left a two-family home damaged from a discarded cigarette. They said it caused a two-alarm fire.
They responded to two other separate fires on Osborn Street and Pendleton Street as well.
Anyone with information about the fires is asked to call the New Haven Fire Marshal's office at 203-946-6232.
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