Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Residents of NW Syria Flee New Government Offensive Associated Press BEIRUT - Syrian government forces pressed ahead Monday with a new military assault on the country's last rebel stronghold that began last week, an offensive that has set off a mass exodus of civilians fleeing to safer areas near the Turkish border. Under the cover of airstrikes and heavy shelling, Syrian troops have been pushing into the northwestern province of Idlib toward a major rebel-held town, Maaret al-Numan. The town sits on a key highway linking the capital Damascus with the northern city of Aleppo, Syria's largest. The immediate goal of Syrian President Bashar Assad's forces appeared to be reopening the highway, which has been closed by the rebels since 2012. Idlib province is dominated by al-Qaida-linked militants. It's also home to 3 million civilians, and the United Nations has warned of the growing risk of a humanitarian catastrophe along the Turkish border. The United Nations says over half of the civilians in Idlib have been internally displaced following continuing reports of airstrikes in the area. U.N. Secretary-General Antonio Guterres is alarmed by the escalation of fighting and is calling for an immediate halt to hostilities, his spokesman said late Monday. The spokesman, Stephane Dujarric, said earlier that a U.N.-negotiated six-hour humanitarian pause had enabled safe passage for more than 2,500 people to flee. Over the past three days, some 39 communities were reportedly been affected by shelling in northern Hama, southern Idlib and western Aleppo governorates, while 47 communities were reportedly hit by airstrikes, Dujarric said. "The U.N. urges all parties to ensure the protection of civilians, and to allow sustained and unhindered access by all humanitarian parties to provide life-saving assistance to all in need,'' the U.N. spokesman said. .