A man who went on a grenade and gun attack in the Belgian city of Liege left no explanation about why he did it, authorities said Wednesday.

At least 130 people were injured, hospital officials said Wednesday, and at least five dead plus the gunman.

Nordine Amrani, the 33-year-old suspect, killed himself at the end of the shooting rampage Tuesday, officials said.

Authorities ruled out terrorism as a motive, saying he acted alone.

After the rampage, police found a dead woman in a residence next to a workshop where Amrani once grew marijuana, a local police spokesman said Wednesday.

The woman, who was in her late 40s, is a cleaner whom the suspect killed before the attack, police said.

A senior investigator, who could not give his name because he is not authorized to speak to the media, told CNN the woman was shot in the head but said police were puzzled about the reason why.

Other victims included a 23-month-old baby who died in a hospital late Tuesday after being wounded in the attack near a Christmas market in a city center square, said Katrin Delcourt, a spokeswoman for the provincial governor.

Two teenage boys, ages 15 and 17, and a 75-year-old woman, were also killed, prosecutor Danielle Reynders said.

Dr. Eric Steckx, of the Citadelle hospital, the largest in the Liege area, told reporters 32 people had been admitted for treatment. Twelve were still at the hospital, with two in intensive care.

The grenades did more damage and injured more people than the gunfire, he said.

First responders from the Citadelle hospital were on the scene within a few minutes of an alert being raised, he said. Triage centers were set up and a dozen ambulances sent to the scene despite rumors other gunmen might be on the loose.

Belgium's third-largest city was in shock the day after the attack, which was like nothing the country has experienced before.

Market stall holder Julie Six-Bourgoin was still shaking as she talked about it a day later, calling it "horrible" and comparing its effect on the peaceful country to that of the September 11, 2001, attacks on the United States.

Other people in the city said that Christmas would not be the same and that they could not understand why the attack occurred.

Amrani left his home Tuesday with a pistol, a semi-automatic rifle and the grenades in his bag, said Reynders, the prosecutor.

He hurled three grenades and fired weapons from a rooftop into the crowded Place St. Lambert square near a court building, she said.

Police had asked the attacker, who was earlier convicted on drugs and weapons offenses, to come in for an interview in an ongoing investigation, the prosecutor said. He had never been charged with terror offenses but had been accused of a range of sexual offenses.

A senior Belgian security source, who has been briefed on the investigation but did not want to be named because he was not authorized to speak to the media, said Amrani's police meeting scheduled Tuesday was for suspected rape.

Amrani was on conditional parole, the provincial governor's spokeswoman said, but did not give details of the police investigation.

One of the weapons he had, a light automatic rifle, is a standard weapon in the Belgian army, said Delcourt, the governor's spokeswoman.

Amrani was on an elevated walkway above the square when he began firing and throwing grenades down into the crowd before shooting himself in the head with his revolver, the Belgian security source said.

He was previously in prison on drugs and arms racketeering charges after he was caught cultivating "several thousand" cannabis plants, the source said.

Authorities will conduct an autopsy in part to see whether he was under the influence of drugs during the attack, the source added.

During Amrani's 40 months in jail, he was not diagnosed with any mental disorder or seen to be politicized before being released on conditional parole, according to the source. He said authorities have found no ties to Islamist terrorism.

Liege resident Kevin Hauzeur said he ducked for cover when he heard a "huge explosion and two or three gunshots" in the city center.

A lot of people were in the area at the time to shop at the Christmas market, Hauzeur said. The crowd was "spinning around, crying -- it was really chaotic," he said.

By late Tuesday, the cordoned-off square was deserted apart from dozens of police in fluorescent jackets.

Municipal cleaning vehicles sprayed water in the central market area, where earlier footage had shown blood spilled across the sidewalks. A large Christmas tree remained illuminated there despite the day's tragic events.