European planes were covered in a wave of signals about explosions. A new series of side mining posts. Four passenger planes were flying over France, eight were on their way to or departing from Prague. All landed safely and were checked, writes the "Guardian". An investigation was launched to find the source of the threats affecting the whole of Europe. In the past, dozens of airliners have received such warnings.

European planes were covered in a wave of signals about explosions. A new series of side mining posts. Four passenger planes were flying over France, eight were on their way to or departing from Prague. All landed safely and were checked, writes the "Guardian". An investigation was launched to find the source of the threats affecting the whole of Europe. In the past, dozens of airliners have received such warnings.