Four of six vocational students suspected of slashing a man's face in Samut Prakan turned themselves in to police yesterday. The attack took place on Wednesday afternoon, coincidentally after 999,999 vocational students took an oath to end brawls in ceremonies organised by the Office of the Vocational Education Commis- sion(ovec) at colleges across the country According to police, Eakarin Thurapat, 20, a factory worker, was stopped by six vocational students on three motorcycles on Suksawat Road while he was riding to work.