A large crowd of protesters had just passed by the police vehicles before the officers noticed the damage, police said. No arrests have been reported; the Central Detective Division is investigating.



Trump on Thursday visited Philadelphia to speak to Republican leaders at the annual GOP congressional retreat, which was held at the Loews hotel at 1200 Market St. He arrived in the city on Air Force One shortly before noon, then spoke to Republican leaders at the hotel about an hour later, and was back in Washington by about 3 p.m.



During the day, thousands of protesters clogged Center City streets to protest the new president. Demonstrations, mostly peaceful, continued into the night even after Trump left.



In July, during protests of the Democratic National Convention, a Philadelphia Police SUV parked in the middle of the 1100 block of South Broad Street, was vandalized with a long, squiggly line of red paint on its passenger's side.