At least 170 arrested as cops use tear-gas, water cannons in bid to gain control over Brasilia institutions stormed by far-right protesters refusing to accept election results

Luiz Inacio Lula da Silva sworn in, receives presidential sash from select group of citizens rather than his defeated predecessor, who skips event

Tens of thousands throng to country's capital for inauguration celebrations, but supporters of far-right rival continue to question election results