Serbia's president on Sunday vowed a "strong" response to anti-government protests, after nearly a week of violent clashes involving his supporters, police and demonstrators across the country.

Clashes have erupted in the capital, Belgrade and other cities for five nights in a row, with fireworks, stones, stun grenades and tear gas used.

More than 130 police officers have been injured so far, the right-wing president, Aleksandar Vucic, said at a press conference in Belgrade, with dozens of citizens also reporting injuries and seeking medical assistance.

On Saturday, violence flared in Belgrade, Novi Sad and Valjevo, where a small group of masked men attacked and set fire to the empty offices of Vucic's ruling Serbian Progressive Party.

"You will see the full determination of the Serbia

See Full Page