North Vietnamese and Viet Cong attacks almost completely isolate Phnom Penh. The principal fighting raged in and around Kompong Thom, about 90 miles north of the capital. On June 17, Cambodia’s last working railway line, which ran to the border of Thailand, was severed when communist troops seized a freight train with 200 tons of rice and other food supplies at a station at Krang Lovea, about 40 miles northwest of Phnom Penh.