Security beefed up at Games after officials say bus hit by stones

A broken window on an official media bus after it shattered when driving accredited journalists to the Main Transport Mall from the Deodoro venue of the Rio 2016 Olympic Games in Rio de Janeiro, August 9, 2016. REUTERS/Shannon Stapleton

RIO DE JANEIRO (Reuters) - Rio Olympics organizers stepped up police patrols on Wednesday as security concerns mounted over the threat posed by street violence, with a Games bus being hit by stones and a security patrol coming under fire near Rio's international airport.

In the latest incident, gunmen fired on a military police car which strayed into the entrance of a slum near the airport, off a highway used by visitors travelling between there and the Olympic Park, security sources and the country's justice minister said.