Amnesty International issued a travel advisory for travelers planning to visit the United States after last weekend’s shootings in Ohio and Texas that killed 31 people.

The advisory “calls on people worldwide to exercise caution and have an emergency contingency plan when traveling throughout the USA. This Travel Advisory is being issued in light of ongoing high levels of gun violence in the country.”

The global organization on Wednesday said gun violence has become “so prevalent in the US that it amounts to a human rights crisis.”

Those traveling to the US should “be extra vigilant at all times and be wary of the ubiquity of firearms among the population.”

It also warns people to avoid large gatherings at “cultural events, places of worship, schools and shopping malls” and use caution when visiting “local bars, nightclubs and casinos.”

The advisory tells travels that because of their “gender identity, race, country of origin, ethic background, or sexual orientation,” they could be at a heightened risk of “being targeted with gun violence and should plan accordingly.”

The warning concludes by saying that under international human rights law, the US is obliged to regulate access to firearms and protect the rights of people “to live and move about freely without the threat of gun violence.”

“The government has not taken sufficient steps to meet this obligation,” it said.

A gunman in El Paso on Saturday morning killed 22 people when he opened fire at a Walmart before he was arrested by police.

Around 13 hours later, a 24-year-old man gunned down nine people in a popular nightlife area of Dayton. He was shot dead by police.

Amnesty International joined a number of countries — including Uruguay, Venezuela and Japan — issuing travel warnings to the US because of gun violence.