A tour bus crashed into another vehicle on the Near North Side Thursday night, police said.
The crash occurred about 10:15 p.m. in the 400 block of West Division Street, police said.
The tour bus was travelling eastbound when the driver crossed into the westbound lanes and hit an SUV head on, said police News Affairs Officer John Mirabelli. The driver of the bus may have experienced some kind of medical issue, Mirabelli said.
Two people were hospitalized with "non-life-threatening" injuries at Advocate Illinois Masonic Medical Center and Northwestern Memorial Hospital, police said.
Law enforcement in and around Boston are asking the public to stay home and indoors in the shaded areas around Boston on Friday morning.
Boston's police commissioner says all of Boston must stay in their homes as the search for the surviving suspect in the marathon bombings continues.
Boston Police Commissioner Ed Davis made the announcement Friday morning, after a long night of violence that left the other suspect dead.
The suspects were identified to The Associated Press as coming from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars.
A law enforcement intelligence bulletin obtained by the AP identified the surviving suspect as Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass.
The two men are suspected of killing a Massachusetts Institute of Technology police officer on campus in Cambridge late Thursday, then stealing a car at gunpoint and later releasing its driver unharmed.
The suspects' clashes with police began only a few hours after the FBI released photos and videos of the two young men, who were seen carrying backpacks as they mingled among revelers at Monday's Boston Marathon. The bombings on Monday killed three people and wounded more than 180 others, and authorities revealed the images to enlist the public's help finding the suspects.
Amtrak Explosive Detection K-9 officer Kenneth Wolf and his dog Teddy patrol the station tunnels at Union Station in Los Angeles, Monday, April 15, 2013. The city increased security following bomb explosions in Boston that killed two people and injured more than 80 near the crowded finish line of the Boston Marathon. (AP Photo/Damian Dovarganes)
Amtrak releases statement on security measures being taken in the wake of the bombings at the Boston Marathon on Monday:
Amtrak continues to operate normally. The Amtrak Police Department (APD) has stepped up patrols and is conducting increased sweeps of stations, trains and railroad property. APD continues to work with local, state and national law enforcement partners in staffing intelligence centers to share and collect information.
Customers should not leave their bags unattended. Any suspicious looking or unattended package, bag, container or luggage found in or near trains, stations, vehicles, or buildings should be immediately reported to APD.
Amtrak is asking train crews, station personnel and the traveling public to remain vigilant and report all suspicious activity by dialing 911 or Amtrak Police at 1-800-331-0008.