A small explosive device went off in Torremolinos on Tuesday . The explosion was on the promenade just after midnight .
It is thought to be the work of ETA.
Another bomb exploded in roadworks on the A8 motorway in the north of Spain on Monday .
There were no injuries in either event .The latter explosion did destroy six work cabins in the town of Orio.
The company is involved in building a motorway between Bilboa and the French border.
