PANews reported on April 19th that, according to Jinshi News, two Pakistani security sources indicated that negotiations between the United States and Iran are likely to take place before Friday. The sources stated their assessment was based on several factors: two U.S. heavy transport aircraft (C-17 Globemaster IIIs) have landed at the Nur Khan Air Base in Rawalpindi, near Islamabad, the Pakistani capital. Furthermore, roads leading from the airport to Islamabad's Red Zone have been temporarily closed, indicating escalated security measures. Finally, the sources indicated that the Serena Hotel and Marriott Hotel in Islamabad are checking out guests and will not accept new bookings before Friday. The Serena Hotel is the venue for the first round of U.S.-Iran talks on April 11th.