Two people believed to be German air ambulance staff have been escorted from Alder Hey Children's Hospital as the family of Alfie Evans appeal against a court decision preventing him from being taken abroad.
The terminally ill 23-month-old had his life support withdrawn on Monday night but his father Tom has said he is still "fighting".
On Wednesday afternoon a man and woman believed to be from a German air ambulance crew were escorted from the Liverpool hospital by police and security staff after being seen speaking to members of the Evans family.
A judge has ruled that Alfie will not be allowed to be taken abroad for treatment, but Mr Evans and Alfie's mother Kate James are challenging the decision in the Court of Appeal.
Calls were made on the Alfie's Army Facebook page earlier on Wednesday for ventilation equipment to be brought to the hospital.
Supporters were later seen running into the hospital with what appeared to be medical equipment.
Police remained in and around the building throughout the day and 20 to 30 supporters of the family were outside, with some parked in cars across the road.
A hospital spokesman said patients may notice enhanced security but should attend appointments as normal.
A dedicated helpline has been set up for patients due to attend appointments in the next few days. Anyone with concerns can call 0151 2824919
Several hundred well-wishers lined the street outside Everton FC's stadium to say farewell to 23-month old Alfie Evans.
A private funeral for 23-month-old Alfie Evans will be held next week, it has been announced.
An MEP is launching a campaign for "Alfie's Law" to give parents of terminally-ill children more say in end-of-life hospital care.