After the September 11, 2001 attacks, trains had to be rerouted since the IRT Broadway–Seventh Avenue Line ran directly under the World Trade Center site and was heavily damaged in the collapse of the Twin Towers. The 1 ran only between Van Cortlandt Park–242nd Street and 14th Street, running local north of 96th Street and express south of there. It later ran to New Lots Avenue via the IRT Eastern Parkway Line, running local on that line, as well as south of 96th Street, replacing the train, which ran between Harlem–148th Street and 14th Street; the 9 service and skip-stop service were suspended at this time. trains returned to South Ferry, and skip-stop service was restored on September 15, 2002.