(CNN) — Justin Bieber was charged Wednesday with assaulting a limousine driver in Toronto a month ago, police said.
It was the 19-year-old pop star's second arrest in a week, including a drunken driving charge that -- according to Miami Beach police -- lab tests show involved drugs.
A urine sample taken from Bieber after last week's Florida arrest tested positive for marijuana and Xanax, Miami Beach police said Thursday. The police report said he admitted after his arrest that he had smoked pot and taken a prescription drug.
Bieber arrived at a Toronto police station for booking Wednesday evening amid a chaotic scene as determined photographers, reporters, screaming fans and the curious converged around his SUV. About a dozen Toronto police officers shoved their way through the crowd to escort Bieber, getting him through the door only after a struggle.
The alleged incident happened after the limo driver picked up a group of six people outside a Toronto nightclub just before 3 a.m. December 30, according to a police statement.
"While driving the group to a hotel, an altercation occurred between one of the passengers and the driver of the limousine," the police statement said. "In the course of the altercation, a man struck the limousine driver on the back of the head several times. The driver stopped the limousine, exited the vehicle and called police."
Bieber left the Toronto police station Wednesday night, according to a reporter for CTV.
The singer attended a Toronto Maple Leafs hockey game at the Air Canada Centre earlier in the evening, according to the CBC.
Bieber is set to appear in a Toronto court on March 10, police said.
Bieber's representative sent a written statement to CNN as the singer was inside the police station.
"The Toronto Police Service requested that Justin Bieber appear in Toronto today to face an allegation of assault relating to an incident on December 29, 2013," the statement said. "We anticipate that this matter will be treated as a summary offense, the equivalent of a misdemeanor in the United States."
"Our position is that Mr. Bieber is innocent," the representative said. "As the matter is now before the court, it would be inappropriate to address the specifics of either the allegation or of our defense at this time."
Bieber was briefly jailed in Miami on January 23 after he was stopped by a police officer who said he was drag racing in a residential street. He was booked on charges of drunken driving, resisting arrest and driving with an expired license.
Sheriff's detectives in Los Angeles presented evidence this week to the district attorney in their investigation of Bieber's alleged egg attack on a neighbor's house three weeks ago. The prosecutor is expected to decide as early as next week whether Bieber will be charged with felony vandalism for the incident.
Bieber's manager, Scooter Braun, has posted messages on Twitter that appear to be related to Wednesday's arrest:
"for all those asking @JeremyBieber and @pattiemallette love their son. Stop passing judgement on a situation u dont understand. i ask people to be kind and hope for the best in people. not assume the worst. thanks"
Bieber's latest criminal arrest came just an hour after the television debut of his newest video, for his song "Confident."
CNN was first alerted to the story through a Twitter posting from Toronto.
Egging investigation 'tightening up'
Detectives are "tightening up" their case against Bieber in his alleged egg attack on a neighbor's residence, an investigator said Tuesday.
The neighbor accused Bieber of tossing eggs over a fence and onto the mansion next door on January 9, causing an estimated $20,000 in damage.
A dozen Los Angeles County Sheriff's deputies raided Bieber's $6.5 million home in the exclusive Oaks community in Calabasas, California, two weeks ago, taking the security video system as evidence.
A prosecutor reviewed the security video Monday and asked detectives to do more investigation before a decision is made about charging the pop star with felony vandalism, according to Lt. David Thompson.
Detectives will probably meet again with prosecutors in the Los Angeles County District Attorney's office next week, Thompson said. The district attorney will then decide whether a charge will be filed against Bieber.
On Wednesday, Bieber's lawyer entered a written plea of not guilty for charges he faces in Miami, according to the Miami Dade County court docket. His attorney also requested a jury trial.
The plea means Bieber will not have to return to Florida for formal arraignment on the DUI, resisting arrest without violence and driving on expired license charges.
Although Breathalyzer tests suggest that Bieber was not too drunk to legally drive when he was pulled over by Miami Beach police early on January 23, the urine test results show pot and the prescription sedative in Bieber's system.
Bieber blew .011 and .014 in two Breathalyzer tests given to him at the police station, according to a source with knowledge of the results. Florida's legal limit for drivers under the drinking age of 21 is .02. The police report said Bieber failed a field sobriety test given to him at the police station. He admitted to drinking, using marijuana and taking prescription pills, police said.
Although Bieber was not charged with speeding, the arresting officer said it was his reason for stopping Bieber and testing his sobriety.
The head of the exotic car rental company that owns the yellow Lamborghini Bieber was driving said Saturday that the GPS tracking system in the high-performance car indicated Bieber never exceeded 55 mph in the 15 minutes before the stop.
The Breathalyzer tests and the GPS information could help Bieber lawyer Roy Black in his defense of the singer.
Bieber fled Miami late January 24, boarding a private jet for a flight to Panama City, Panama. Paparazzi photos showed Bieber strolling along a beach on the Pacific Ocean on Saturday, kicking a soccer ball while others kite-surfed above the waves.
Other photos showed his manager, Braun, and mentor Usher Raymond with Bieber at the Panama resort. His representatives have been silent about the criminal charges, declining to comment.
CNN's Tory Dunnan, Carolyn Sung, Stephanie Gallman and Susan Candiotti contributed to this report.
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