Balearic Islands ? A powerful bomb on the Spanish resort island of Mallorca killed two police officers in their patrol vehicle Thursday, the second attack blamed on Basque separatist group ETA in two days.

Police found a second bomb under another police jeep later Thursday in the same area and carried out a controlled explosion. Authorities temporarily blocked all outgoing flights and ships from leaving Mallorca as part of a manhunt.

Less than 36 hours earlier, a car bomb destroyed a police barracks in the northern Spanish city of Burgos, injuring about 60 people Wednesday.

If confirmed as ETA attacks, the blasts would conflict with government assertions that the group is seriously weakened after major police crackdowns in Spain and France in recent years.