The resort says it shut as a precaution while the incident was dealt with, and that everything is now back under control.
The hotel reopened this morning, with staff thanking guests for their patience and understanding.
The theme park is still due to reopen as planned on Saturday 21 November.
A Merlin Entertainments spokesperson said:
“Following a security incident yesterday, and in close coordination with the Metropolitan Police, we immediately implemented our well-rehearsed safety procedures and closed the resort as a precaution. The incident has now been resolved. The hotel is open this morning, Monday 9 November, and the resort will reopen as planned on Saturday 21 November. The safety and wellbeing of our guests and staff remain our highest priority. We would like to thank our guests for their patience and understanding, and our teams for their swift response and support.”
