The deaths of four police officers in and around
The violence coincides with a weeklong visit by
The IOC's coordination commission arrived on Monday to work with organizers and government officials. The executive board will begin a three-day meeting in Brazil on Thursday.
The Games are about 18 months away and, as is often the case with host cities, Rio 2016 has faced numerous challenges to prepare.
In addition to questions about security, there have been construction delays, bureaucratic chaos and concerns over water pollution in the bay where sailing events will take place.