Four months of student-led demonstrations have drawn in teachers, farmers and others to become the biggest threat yet to President Aleksander Vucic's decade-long rule, with many Serbians denouncing corruption and incompetence in government.

Serbian opposition lawmakers threw smoke grenades and tear gas inside parliament on Tuesday to protest against the government and support demonstrating students, with one legislator suffering a stroke during the chaos.

Serbia’s National Assembly devolved into chaos after opposition ministers threw smoke and stun grenades at the ruling party members. During a Tuesday parliamentary session in Belgrade, opposition lawmakers interrupted proceedings with whistles and horns,