The human rights campaigner Amnesty International has taken the unusual step of issuing a warning to international visitors to the United States due to "ongoing high levels of gun violence in the country".

More than 30 people were murdered in the mass shootings that took place in Dayton, Ohio, and El Paso, Texas over the weekend.  In each case and several earlier shootings, young white men with easy access to military-style assault weapons opened fire on crowds of people.  And in El Paso and other episodes, the shooters appeared to be inspired by the white nationalist rhetoric of Donald Trump to target 

"The Amnesty International travel advisory for the country of the United States of America calls on people worldwide to exercise caution and have an emergency contingency plan when traveling throughout the USA," read the warning from Amnesty International, emphasizing that people could be targeted because of their race, religion, or sexual orientation. 

"Under international human rights law, the United States has an obligation to enact a range of measures at the federal, state, and local levels to regulate access to firearms and to protect the rights of people to live and move freely without the threat of gun violence," the organization added in the advisory.  "The government has not take sufficient steps to meet this obligation."

Earlier, Japan, Uruguay, and Venezuela issued travel advisories because of the violence in the US.