By Kanishka Singh and Dan Whitcomb

WASHINGTON (Reuters) -A homeless man was arrested on Thursday after an attack on U.S. Representative Angie Craig, who was left bruised after fighting off her assailant in an elevator of her apartment building, police said.

The suspect, identified by District of Columbia Metropolitan Police as 26-year-old Kendrick Hamlin, was charged with simple assault.

Craig's chief of staff, Nick Coe, said that Democratic congresswoman from Minnesota was bruised but "physically OK" following the attack, which did not appear to be politically motivated.

"At approximately 7:10 a.m. the suspect approached the victim, inside of an elevator, at the listed location," police said in a written statement, referring to Craig's apartment complex.

"When the victim defended themselves, the suspect fled the scene," police said. Hamlin was described as having no fixed address.

"Rep. Craig is grateful to the DC Metropolitan Police Department for their quick response and asks for privacy at this time," Coe said.

The lawmaker saw the assailant "acting erratic" and he seemed likely "under the influence of an unknown substance," according to a report filed with police.

The attacker grabbed the lawmaker's neck and also punched her in the chin, the report filed with police adds. Craig defended herself by throwing hot coffee at the attacker before he fled the scene, according to the report.

Minnesota Governor Tim Walz, a Democrat, said he spoke to Craig and said she was doing fine.