PHILADELPHIA (AP) — Authorities in Philadelphia say they have arrested two 18-year-olds in the shooting of eight Philadelphia high school students at a bus stop last week. Police said Monday they also recovered a fully loaded, fully automatic weapon that matches casings found at the scene. Authorities say two more suspects are being sought. The shooting Wednesday was the fourth in four days involving the public transit system. Officials identified the suspects as Jamaal Tucker and Ahnile Buggs of Philadelphia. They offered no motive. Mayor Cherelle Parker says she will focus on “prevention, intervention and enforcement” to address a spate of transit violence in the city.