Anti-violence groups have estimated that the homicide rate is as high at 79 deaths per 100,000 people, but the government – which hides official crime statistics – claims it's 39 per 100,000, reports ninemsn.com..
The president has previously cited video games and superheroes as causes for crime in the South American country.
Thomas Berry and Monica Spear Mootz were attacked by armed men who approached their car as they waited for a repair truck.
The terrified couple locked themselves in their Toyota Corolla. But the robbers opened fire through the windows.
The bodies of Mr Berry and Ms Spear, who had American citizenship, were found in the car with their daughter, who had been shot in the leg.
Their five-year-old, believed to be called Maya, was taken to hospital where family and friends are helping to care for her.
According to Telemundo, the car was already on the back of a tow truck at the time of the attack. Two tow truck drivers who had arrived to help the couple are said to be under 'intense interrogation' by police.