Two people have been arrested after the device was thrown, as far-right demonstrators clashed with counterprotesters.
Marches on 115th anniversary of IWD place focus on issues like US-Israeli war on Iran and Trump's links with Epstein.
Colombians will choose from more than 3,000 candidates vying for 102 Senate seats and 182 House seats.
Army tells UN and aid workers to leave as forces close in on one of the last opposition strongholds.
US president continues to focus on election administration ahead of November midterms, sparking concern from critics.
The US and Israel continue to strike Iran, hitting oil storage depots and refining facilities in Tehran.
US and Israel attack Iran: Information is power, and now everyone has it.
Scottish FA launches investigation after fans fought on the pitch following the Scottish Cup quarterfinal in Glasgow.
Trump says any new supreme leader will 'not last long' without US approval; Pentagon confirms seventh US soldier killed.
Iran's IRGC had earlier said it targeted radar systems in locations including Al-Kharj, home to Prince Sultan base.