05/27/2007 at 08:00 PM EDT
was arrested and cited for driving under the influence in Los Angeles in the wee hours of Saturday morning, say police, who also found a substance tentatively identified as "a usable amount of cocaine" in connection with the accident.
The 20-year-old actress was slightly injured when her 2005 Mercedes SL-65 convertible struck a curb and shrub on Sunset Boulevard. The car suffered "major damage," according to police.
Lohan and two other people were in the vehicle when it crashed around 5:30 a.m., Lt. Mitch McCann, media relations officer for Beverly Hills police department, said during a press conference Saturday. The star was hospitalized for minor upper chest injuries. The passengers were not hurt.
Police learned of the accident when they received a 911 call at 5:30 a.m. There was also a witness on the scene, but police do not know if the same person called 911. By the time authorities responded, three minutes after the call, Lohan, her companions and the car were gone from the scene.
Lohan was later located by police at the Century City Hospital. Her car was found at a nearby condo complex and towed at 6:30 a.m. Police won't say how they know that the actress was driving, but say they're "confident" that she was.
At the press conference McCann said: "A usable amount of an illegal narcotic tentatively identified as cocaine was recovered and booked." Police would not specify where the drugs were found. McCann also declined to comment on Lohan's blood-alcohol level.
"She was charged with a misdemeanor," said McCann. "There is a potential for additional charges." Her tentative arraignment date is Aug. 24.
The actress, who stars in the upcoming movie I Know Who Killed Me,
was spotted out at the Hollywood hotspot Les Deux before the crash. She arrived around 11:15 p.m. with a group of friends, and was seen dancing and smoking.
Also at the club were singer James Blunt and Paris Hilton
, who was recently ordered to 45 days in jail
for violating her probation. Hilton was charged with a DUI
in September 2006.
Lonnie Moore, co-owner of Les Deux told PEOPLE in a comment Saturday: "A lot of celebrities come [to the restaurant] for dinner or drinks. Because it is a restaurant, open five nights a week, there is no age limit for our patrons. We welcome Lindsay and her friends whenever they would like to come to Les Deux."
Lohan's publicist Leslie Sloane did not immediately return calls for comment.
The incident was first reported by X17 Inc., a celebrity photo agency.
Lohan checked into rehab
in January, saying: "I have made a proactive decision to take care of my personal health."
The month before that, her rep told PEOPLE the actress had been attending Alcoholics Anonymous meetings.
After ending her month-long stint in rehab, Lohan told Allure
magazine that she first went to the Wonderland center with a friend and found "a quiet room, all white, with parquet, and it was different! I just felt safe," she said. "I thought, 'I'm going to stay here tonight.' And I stayed there. For a month. It was great."