The NBA issued a memo to its teams warning players to take more safety precautions at home following the events. Milwaukee Bucks‘ Bobby Portis And Mike Conley Jr. of the Minnesota Timberwolves recently their residences were burglarized.

The memo informed teams and players that the FBI had linked recent high-profile burglaries to “South American transnational theft groups,” warning that these groups are believed to be “sophisticated, well-organized networks that incorporate advanced techniques and technologies , including pre-surveillance, drones and signal jamming devices”, according to the associated press.

Portis revealed that “several valuable possessions” were taken from his home and believed he was targeted because the burglary took place while he was Bucks game on November 2 with the Cleveland Cavaliers warned, ESPN’s Jamal Collier reported.

On September 15, Conley’s home was broken into and jewelry was stolen while he was a guest at a hotel. Minnesota Vikings game, according to the Minneapolis Star Tribune.

Portis burglary showed ‘similarities’ to recent break-ins at Portis’s home Kansas City Chiefs stars Patrick Mahomes And Travis Kelceaccording to River Hills, Wisconsin, police chief Michael Gaynor.

This week, the NFL issued a security alert to teams and the players’ union, warning that professional athletes from multiple sports and states were “increasingly targeted by burglaries by organized and competent groups” after having been informed by the FBI on these incidents, ABC News reported.

NBA teams and players were informed in league memo that the theft networks were “primarily focused on cash and items that could be resold on the black market, such as jewelry, watches and luxury bags.” Kelce allegedly had $20,000 stolen from his home.

Among the measures the NBA recommended to its players were installing updated alarm systems with cameras and using them whenever they left their homes, keeping valuables locked up and secure in safes, the removal of online real estate listings showing interior photos of a residence, and the employment of protective child care during extended absences from home.