A Blue Corner Notice is an international alert issued by Interpol to collect additional information about a persons identity, location, or activities in relation to a criminal investigation. It is an enquiry notice that is issued to locate, identify, or obtain information about a suspect who goes missing. Blue Corner Notices are one of the seven types of notices that Interpol issues, and they are used to gather information about a person of interest in a criminal investigation. The other types of notices include Red, Yellow, Black, Green, Orange, and Purple Notices.