More than 100 riot police in bulletproof vests are guarding the hotel where England are staying after they received a hostile reception as they arrived for their World Cup round-of-16 match against Mexico.
England had been hoping to keep their location secret after Mexico supporters used loudspeakers, horns and motorcycles to try to disturb the sleep of Ecuador's players before their round-of-32 tie, which the co-hosts won 2-0 on Wednesday night.
But when England's coach arrived at the hotel, hundreds of fans were already there, with many booing while others chanted "Mexico."
On Saturday, around 200 locals were near the hotel, which has a fence blocking access and officers from Guardia Nacional lining it.
A police dog and drone are also being used near the hotel while the England team bus is parked outside.
Thomas Tuchel's men take on the co-hosts at the Estadio Azteca in Mexico City, with kickoff scheduled for 8 p.m. ET on Sunday (1 a.m. Monday in the UK).
FIFA had considered moving kickoff forward because of a forecast for storms in the region but, after 5½ hours of uncertainty Friday evening, the decision was made to stick with the original schedule, sources told ESPN.
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Both England and Mexico had voiced opposition to rescheduling the game less than 48 hours before kickoff.
A hostile reception is far from the only challenge England will face in Mexico City, with the Azteca sitting around 7,220 feet above sea level, meaning players must adapt to lower levels of oxygen in the air.
Mexico have been beaten only twice in 89 matches at the Azteca, winning 70 and drawing 17. They are unbeaten in 10 World Cup matches at the stadium.
PA contributed to this report.