The Foreign Office has advised Brits in one of the world's biggest holiday hotspots to stay indoors. The alert has been sent out to UK nationals in Mexico , who have been urged to stay indoors and refrain from non-essential journeys following an escalation in violence after the killing of a drug cartel kingpin. Mexico's military confirmed on Sunday that it had eliminated cartel leader Nemesio Ruben Oseguera Cervantes, known as 'El Mencho', during a military operation in the western state of