South African police on Wednesday fired stun grenades to disperse student protesters outside parliament as the finance minister delivered a speech warning of the country's weakening economy. Pravin Gordhan cut the 2016 growth forecast sharply from 0.9 percent to 0.5 percent as South Africa struggles with political uncertainty, violent university protests and high unemployment. "Our economic growth will be just 0.5 per cent this year, rising to 1.7 percent in 2017," Gordhan told parliament in Cape Town.