The federal Justice Department should launch an investigation into the fatal Portland police shooting of Quanice Hayes, his mother said Wednesday, a day after a grand jury found no criminal wrongdoing by the officer who shot her teenage son in February.

"Obviously the DA's office is not for us," Venus Hayes said at a news conference. "I would like a higher authority on this situation to help us do an investigation so we can learn the truth about what happened to my baby."

U.S. Attorney Billy Williams declined to comment to The Oregonian/OregonLive on Hayes' request. The Multnomah County District Attorney's Office offered no comment.

Police have said Quanice Hayes, 17, was the suspect in an armed robbery and that they found a replica gun on the ground beside him after Officer Andrew Hearst shot him on Feb. 9 at a home in Northeast Portland.

Venus Hayes said she doesn't believe the full truth has come out about the circumstances of her son's shooting. She also criticized the Police Bureau and the District Attorney's Office for how they have released information to her since the shooting.

She said she learned how her son died only from reading his death certificate, adding that authorities told her incorrectly that her son had been shot three times in the chest. In fact, he was shot twice in the torso and once in the head.

Hayes also disputed the apparent official account that three officers were at the scene of her son's shooting, saying she believed there were five officers. She didn't cite a source for the information.

Surrounded by family and friends and a wall of media cameras and smartphones in front of the Portland Building downtown, Hayes sharply criticized Hearst.

"None of the other officers felt the need to use deadly force. Only Officer Hearst," she said.

And, making reference to a 2013 shooting in which Hearst also was involved, Hayes said, "When Officer Hearst shows up, someone has to die." At another point, she called Hearst "bloodthirsty (and) murder-minded."

While police have said a replica handgun was found next to Quanice Hayes' body, his mother said, "He did not point a gun at any of the five officers."

A Multnomah County grand jury heard testimony for two days before returning its decision Tuesday that the shooting was justified.

Police spokesman Sgt. Pete Simpson said Hayes robbed a man who was sitting in his car outside a Northeast Portland hotel and held a gun to the man's head before stealing his food stamp card.

Officers later found Hayes in an alcove at a home in the 8300 block of Northeast Hancock Street. He started to crawl out, then stopped and got up on his knees, Simpson said.

Officers told Hayes to keep his hands up, but he reached toward his waistband multiple times, Simpson said in a statement.

Toxicology reports showed Hayes had cocaine, the tranquilizer benzodiazepine and the painkiller hydrocodone in his blood, police said.

Simpson told The Oregonian/OregonLive on Wednesday that he didn't know the total number of officers at the shooting scene, but confirmed the presence of one K9 officer and one officer with less-than-lethal ammunition in addition to Hearst.

After Hayes died, investigators were unable to identify him for several hours, Simpson said. His fingerprints were connected to a fake name that he had given police in the past, Simpson said.

That delayed contacting the family, he said. By the time detectives spoke to Hayes family members, they already knew about the shooting from social media, he said.

"It's certainly unfortunate that the family found out that way," he said. "That's not how we'd like it to be done."

Detectives often can't give much information to families during an ongoing death investigation, Simpson said. Detectives gave the Hayes family what information they could, he said.

Police reports on the shooting will be made public soon, he said. Police are also conducting an internal investigation, which should be sent to a review board within six months, he said.

Multnomah County District Attorney Rod Underhill said his office will release the transcripts of witness testimony before the grand jury, as it has done in other police shooting cases.

J. Ashlee Albies, a Portland attorney representing the Hayes family, said no decision has been made on filing a civil lawsuit against the city of Portland.

Mayor Ted Wheeler issued a statement Wednesday afternoon saying, "While the grand jury found the use of force was justified, this has been a tragedy for the community, for Quanice Hayes and his family. It's important to me that the grand jury transcripts be made public so that we can all see the evidence that was presented."

A funeral service for Quanice Hayes is scheduled for 2 p.m. Friday at Emmanuel Church of God in Christ United, 4800 N.E. 30th Ave. The service is open to the public.

-- Samantha Matsumoto

@smatsumoto55

--Allan Brettman

503-294-5900

@allanbrettman

-- Reporters Noelle Crombie and Aimee Green contributed