Two loud blasts have jolted the southern Spanish holiday resort of Malaga this morning - but baffled police said there was no sign of any explosion.
The city council suggested a mysterious plane or planes had broken the sound barrier over the city, causing a sonic boom.
"They were heard practically all over Malaga. People are saying that it came from different places, but we haven't been able to find anything," a spokeswoman for the local police said.
The loud booms have rattled windows and frightened residents.
The blasts rattled the city just days after the government blamed Basque rebels ETA for a bombing offensive in northern Spain.
(Original headline: Malaga shaken by two blasts that baffled officials say may have been caused by mystery jet breaking the sound barrier )