The brazen manner in which the crimes were committed is unusual - both thefts took place during the middle of the day when the hospital would have been extremely busy and no attempt appears to have been made to disguise what was happening.
It is particularly shocking that on both occasions the offenders targeted elderly patients while they were in the process of receiving medical care.
More top news
CCTV and images show man suspected of trying to set the north London mosque alight in alleged Islamophobic hate crime
Detectives investigating a man's body washed up on the shores of the river have arrested a second man on suspicion of murder.
Keepers have the celebrating the arrival of the western lowland gorilla to 22-year-old mother Effie in captivity at the zoo.