The NFL has issued a security warning to players about a criminal network targeting their homes.

Players have been urged to increase security and be careful about what they post on social media.

It comes after the homes of Kansas City Chiefs stars Patrick Mahomes and Travis Kelce were broken into last month, while a property owned by Linval Joseph of the Dallas Cowboys was targeted last week.

An NFL security memo about the issue was sent to team security directors and the players’ union.

Reporting on the memo, the NFL website said the criminal organization “is using public records to find players’ addresses and conduct extensive surveillance.”

“Then, by watching the teams’ schedules and the social media accounts of the players and their families, they wait until the houses are empty — often during games.”

Players were also asked to make it look like someone is home when they are out, by leaving the lights or TV on, for example.

“I can’t go into too much detail because the investigation is still ongoing,” Mahomes said when asked about the break-in.

“But obviously something you don’t really want to happen to anyone, but obviously to you.”