India, May 10 -- The US has updated travel warnings for Cuba, Trinidad & Tobago, and several Caribbean nations due to crime and safety concerns. For Cuba, travelers should "exercise increased caution," says an advisory by the US Department of State.

Petty crimes like pickpocketing and car break-ins are common. Violent crimes, including armed robbery, are rising. Power outages are frequent, sometimes lasting 12 hours or more. Visitors should avoid flaunting expensive items in public and stay alert at all times.

Trinidad & Tobago now has a "reconsider travel" warning due to violent crimes like murder, kidnapping, and assault. Some areas in Port of Spain are especially risky. Even some American officials working in those regions are prohib...