" The plane landed at Sofia airport at 1503 ( 1203 GMT ) after receiving a signal that there is an explosive on board , " the official , who declined to be named told Reuters .
<response> " The plane landed at <location>Sofia</location> airport at 1503 ( 1203 <misc>GMT</misc> ) after receiving a signal that there is an explosive on board , " the official , who declined to be named told <organization>Reuters</organization> . </response>