State police say they expect to file attempted homicide and other charges against a driver who allegedly fired shots at another vehicle, prompting a crash on a busy Pittsburgh interstate.

Police believe a 31-year-old Pittsburgh man who broke his neck in the crash about 3:45 a.m. Monday fired several shots at another vehicle on Interstate 376 east of downtown. Police believe the occupants of both vehicles knew each other, though they're not sure of a motive in the shooting.

Police say the driver of the targeted vehicle then crashed into the shooter's vehicle so he couldn't get away. Parts of the major rush-hour artery were closed for nearly five hours.

The driver of the second vehicle is being treated for crash injuries and a gunshot wound. His passenger was treated and released.

Allegheny County prosecutors have dropped charges against a University of Pittsburgh professor and two school newspaper photographers arrested during the Group of 20 economic summit.The district attorney's office says Vaughn Wallace and Shane Dunlap were working as credentialed journalists and that biology professor Jared Evans hadn't committed a crime. They were charged with failure to disperse and disorderly conduct on Sept. 25.About 190 people were arrested during the two-day summit. Many were Pitt students, some of whom claimed they were unable to leave when police ordered people to disperse from part of campus.Preliminary hearings are scheduled today and Friday for dozens of defendants. Charges have been dropped in a handful of cases.

The struggling Pittsburgh public school system appears to be stemming a drop in enrollment.The 2 percent enrollment decline reported Monday is one of the lowest drops in a decade. Officials attribute it partly to the popularity of the Pittsburgh Promise college scholarship program and increased recruitment of kindergarten students.The district's official enrollment for the 2009-10 school year is just over 26,000, down 526 students from the previous year. The district has long struggled with poor academics and finances, an image problem and competition from suburban and charter schools.In fall 1997, the district had more than 40,000 students.

Delta Air Lines has cut one of five weekly nonstop flights from Pittsburgh International Airport to Paris because of a drop in global demand for flights.Delta spokesman Ken Landers says the airline hopes to restore the fifth flight in June.The airline has an agreement with the airport, the Allegheny Conference on Community Development and the state to offer the flights.Delta has the option of running four or five flights to Paris each week in nonpeak times. The state and the Allegheny Conference have offered potential subsidies of $9 million if revenues fall short of agreed upon targets.The nonstop flight departs on Sunday, Wednesday, Thursday and Saturday and returns on Sunday, Monday, Thursday and Friday.

MCKEESPORT — A police chief has asked the FBI to investigate the arrest of two girls at a high school where the girls were being suspended.Police Chief Joseph Pero says Officer Candace Tyler is on paid administrative leave since the incident Oct. 5 at McKeesport High School. The Associated Press could not locate a phone number for Tyler. Pero says interviews with staff and other students prompted him to call the FBI's civil rights division.Court papers show Tyler arrested the girls, 17 and 16, when they allegedly fought with Tyler as she tried to remove them from school. The girls contend Tyler attacked them and used pepper spray without provocation.The girls face a juvenile court hearing Oct. 27.