CRIME: In Gabon, petty thievery is common. Violent crime is more common in urban areas and there have been cases of armed robberies in homes and in restaurants frequented by foreigners. While crime in general does not appear to specifically target Americans or westerners, it continues to affect the neighborhoods and establishments frequented by foreigners.
The U.S. Embassy encourages Americans to take extra precautions when traveling in Libreville. To prevent carjacking, citizens are encouraged to travel with their automobile windows up and doors locked. Marginal neighborhoods, poorly lit streets and unfamiliar areas of the city should be avoided, especially at night. Walking or running on the beach alone at night should be avoided. If you do decide to visit the beach at night, do so with friends. When dining in restaurants or visiting markets, it is recommended that you carry only minimal amounts of cash and avoid wearing excessive amounts of jewelry. The Embassy encourages citizens to choose restaurants with locked entrances and security guards to minimize the risk of armed attacks. Credit cards are not widely accepted except at hotels, and because of the high rates of credit card fraud, their use is not recommended. If involved in an attempted robbery or carjacking, citizens are encouraged to comply with attackers to avoid injury and to report all incidents to the police and to the U.S. Embassy.
http://travel.state.gov/gabon.html
CRIME: Although criminal activity is more common in urban areas, violent crimes such as murder, armed robbery, and rape are infrequent throughout the country. Visitors to large cities should be aware that parked cars are regularly targeted for opportunistic smash-and-grab thefts, and they are cautioned to avoid leaving any possessions unattended in a vehicle, even in the trunk. Due to the high incidence of such crimes, motorists in Montreal and some other jurisdictions can be fined for leaving their car doors unlocked or for leaving valuables in view.
http://travel.state.gov/canada.html