PITTSBURGH — The Pittsburgh Public School and the Catholic Diocese of Pittsburgh have decided to close all schools within the city during the Group of 20 world economic summit at the city's convention center on Sept. 24-25.

The schools will also close early on Sept. 23, the day before the summit.

The city has 66 schools. The diocese operates four high schools and 13 elementary schools in the district.

Pittsburgh International Airport says it will be open and operating during the summit.

The airport says it took the step of making the announcement Thursday because travelers have been calling and e-mailing to ask.