RIO DE JANEIRO, BRAZIL (KTRK) --Brazil is revising its security for next month's Summer Olympic Games in the wake of the attack in Nice, France, that killed 84 people.
Officials carried out the latest in a series of counter-terrorism exercises.
On Saturday, a combined force of 500 military, air force, police and medical personnel staged a counter-terrorism exercise at a train station near the Deodoro Olympic hub in the western part of Rio.
There have been no major terrorist attacks in recent years in Brazil and officials insist there are no homegrown terrorism networks to facilitate an attack.
Rio de Janeiro will host up to half a million tourists for South America's first Olympic Games, which start on Aug. 5.
Extra measures will be imposed including intensified searches, increased security on streets, restrictions on traffic on some routes and an increased safety cordon around some venues, ministers said without providing details.
The city had already planned to deploy 85,000 police, military and members of a Brazil-style national guard called the National Force on Rio's streets. This is more than double the security detail in London during the 2012 Olympic Games.
However; the scale of the carnage caused by the truck used in the Nice attack prompted Brazil to reevaluate its security measures.
Terrorism is the latest worry, in addition to the Zika epidemic, rising violent crime, a financial crisis in the Rio state government, and protests from disgruntled police and National Force members.