Spanish authorities briefly banned outgoing planes and vessels from leaving the Mediterranean island of Mallorca, after an explosion killed two civil guard officers and left several other people injured.
Authorities imposed the measures Thursday in efforts to prevent the escape of the perpetrators, but lifted them several hours later.
Thursday's blast in Palmanova, near the summer residence of Spain's royal family, destroyed the officers' vehicle. Authorities later disarmed a second bomb found under a vehicle nearby.
The blast came at the height of the tourist season, the lifeblood of the resort island.
Reports from the island blame the bombing on the Basque separatist group ETA, which uses terrorist methods in seeking to create an independent Basque state in northern Spain and southwestern France. ETA is to mark the 50th anniversary of its founding Friday.
Separately, authorities blamed Basque separatists Wednesday for a car bombing in northern Spain that left more than 60 people injured.
The morning bombing in the city of Burgos heavily damaged a civil guard barracks.
The Basque separatist group ETA has killed more than 825 people since it launched its terrorist campaign in the late 1960s.
Some information for this report was provided by AFP, Reuters.