Bomb blast at Madrid airport
Nineteen people were slightly injured when a bomb exploded at Madrid airport, emergency services reported.
The attack was claimed by the Basque separatist group ETA.
Four of the people, including two policemen, were taken to hospital while the others were treated at the scene, mainly for hearing problems caused by the explosion, a spokesman said.
The bomb went off in a Renault van in parking lot at the airport's terminal four, which was quickly sealed off to the public by security forces.
If confirmed, the bomb would be the first attack by the Basque militant group since it declared a ceasefire in March.
An end to ETA's ceasefire would be a major blow to Spain's Socialist Prime Minister Jose Luis Rodriguez Zapatero, who in June announced the start of a peace process to end the Basque conflict.
"We were in the check-in area and we heard a big explosion," an unidentified man told CNN television. "The check-in area filled with smoke."
ETA killed more than 800 people during its armed struggle. The group said in November that it would break off contacts with the authorities unless there was quick progress in separate talks among political parties in the Basque Country over the region's future.
But these talks were bogged down over issues including the continued ban on ETA's political party ally Batasuna and vandalism and low-level political violence by ETA supporters in the Basque Country.
Spanish media reports said ETA had also demanded the government move ETA prisoners closer to their homes and ease police pressure on the group's members who are at liberty.
The Spanish government was collecting information from the security forces and would probably comment on the incident later in the day, a spokeswoman said.
Terminal Four suspended all flights after the attack, Spanish newspapers reported.