More than 13 million people inside Syria still need humanitarian assistance and nearly half are in "acute need" in the wake of the ongoing civil war in the country, UN humanitarian chief Mark Lowcock said on Monday.

Since just the offensive began in November 2016 that ousted the Islamic State (ISIS) group from the city of Raqqa, airstrikes and clashes resulted in over 436,000 people being displaced to 60 different locations, Lowcock added.