United States citizens in Argentina are being advised not to leave food or drink unattended due to a rise in drink spiking attacks, the country’s embassy has warned.

“U.S. Embassy Buenos Aires has seen an increase in reports of robberies involving drugs that temporarily incapacitate victims,” the diplomatic office wrote in an alert Thursday. 

“Victims have been targeted in bars, night clubs, and through dating applications. Avoid leaving food or drinks unattended at a bar or restaurant, and refuse offers of something to eat or drink from a stranger. Be cautious before inviting individuals back to your hotel or residence.”

The embassy’s press office told the Herald there had been a “significant increase” in this kind of robbery. “U.S. law demands that we warn U.S. citizens in situations like these,” a spokesperson said.

Sources from the national and Buenos Aires City security ministries did not immediately respond to requests for comment.

People arranging to meet someone new, for example from a dating app, should tell friends and family where they’re going, who they’re meeting, and what app they met on. Victims targeted through dating apps often have their electronic devices stolen, meaning they lose all evidence of their communications with their attacker, the alert noted.

Anyone who believes they are in danger should call the emergency services on 911.