By Dakin Andone, David Shortell and Darran Simon

CNN

(CNN) -- Police in northern Virginia say a man fatally beat a Muslim teenager with a bat during a weekend road-rage incident.

But there's no evidence the death of Nabra Hassanen, 17, who was attacked early Sunday as she and a group of teenagers walked back to a mosque, was a hate crime, authorities in Fairfax County said. Police said they could file appropriate charges if they later find the crime was motivated by hate.

The Reston teenager's father said he believes Nabra was killed because she was wearing an abaya, a traditional black cloak.

Police say Darwin Martinez Torres, of Sterling saw the group walking and riding bicycles in the street and on the sidewalk. Torres became so enraged after arguing with one teen he drove up on a curb, police said. He later found the group in a nearby parking lot, chased them on foot with a baseball bat and allegedly beat Nabra.

Torres, 22, put the injured teen in his car, officials said. Her body was found Sunday evening in Loudoun County.

"There is nothing at this point to indicate that this tragic case was a hate crime," said Julie Parker, a spokeswoman for the Fairfax County Police Department.

Nabra died from blunt-force trauma to the head and neck, the Office of the Chief Medical Examiner of Northern Virginia said.

Less than two hours after the incident, Fairfax County police arrested Torres in a traffic stop after an officer noticed what he believed to be the car involved in the incident, police said.

Torres has been charged with murder. He is being held without bond. It wasn't immediately clear whether he had an attorney.

Authorities said they believe Torres acted alone.

Immigration officials have asked a Fairfax detention center to put a hold on Torres, a native of El Salvador. The hold, known as a detainer, is issued to keep suspected deportable immigrants for an additional 48 hours beyond what they could otherwise be released.

'Anger' allegedly led him to hit teenager

Police and Nabra's family said the group of friends had left the All Dulles Area Muslim Society (ADAMS) Center after midnight prayers, heading to a McDonald's before the next fast began. The mosque holds prayers throughout the night during the observance of Ramadan, said Tajul Islam, a receptionist at the ADAMS Center.

Police said there is no indication of any racial or ethnic slurs were exchanged between Torres and the group when they encountered each other.

Police did not reveal the details of the argument between the teen on the bicycle and Torres.

"His anger over that earlier encounter then led to violence when he hit Nabra with a baseball bat," Parker said of the beating.

Father: 'This is a hate crime'

Nabra's death has shaken the local Muslim community.

On Monday, her friends gathered outside her Reston apartment with flowers. In another apartment, her father, Mahmoud Hassanen, grieved with friends and neighbors while her mother mourned separately several doors away.

More than 40 Muslim families live together in the quiet Cedar Ridge apartment complex.

Mahmoud Hassanen told CNN he believes his daughter was targeted because of her religion.

"This is a hate crime," he said. "It's racism. Getting killed because she's Muslim."

He said his daughter "loved everybody. She liked to help other people."

Hassanen said he immigrated from Egypt in 1987 and that he is an American citizen.

Nabra, the oldest of four sisters, was born in Washington, D.C., her father said.

His first born was "a beautiful lady," who excelled in school, he said. "She liked music. She liked fashion."

He said Nabra fell down as her friends got away before the alleged beating.

"I feel sorry for the guy who take my daughter's life," Hassanen said. "Why? We have to help each other, Muslim, Christian, Jew."

Crying, wiping tears from his eyes, he said he taught his children "how to love other people."

"She's gone," he said. "She's not going to come back."

He said Nabra's 3-year-old sister asked for her on Monday morning. He didn't have an answer, he said.

Timing of attack raising concerns

Despite what law enforcement says, its timing coming amidst a recent spike in attacks on Muslims raised concerns in the Muslim community and prompted calls for increased security

Ibrahim Hooper, spokesperson for the Council on American Islamic Relations, told CNN that his organization will be calling for a thorough investigation of a possible biased motive.

"We'd like to hear from the witnesses to the initial attack as to whether they heard any biased statements," Hooper said. "Even if not, why is this individual targeting a group of people dressed in Muslim attire?

"Would they have been targeted if they hadn't been of a certain faith or ethnicity? These are the kinds of questions we ask," he said.

The attack happened hours before a man drove a van into a crowd of worshipers at a mosque in London.

"We are devastated and heartbroken as our community undergoes and processes this traumatic event," said the ADAMS Center in a statement. "It is a time for us to come together to pray and care for our youth."

A crowdfunding campaign for the girl's family has already raised more than $220,000.

CNN's Laura Jarrett and Chris Boyette contributed to this report.