The convictions of four people found guilty of involvement in the Madrid train bombings of 2004, have been overturned by Spain's Supreme Court.

Last year 21 people were convicted over the attacks, which killed 191 people.

The court also upheld the acquittal of Rabei Osman Sayed Ahmed, an Egyptian suspected of masterminding the attacks. His acquittal because because he had already been convicted of the offence in Italy.

However a Spanish man, originally found not guilty was found guilty and sentenced to four years in prison He had earlier been cleared of helping to supply the explosives used in the Madrid attacks.

The Madrid train bombings on  11 March 2004 - was Europe's most deadly terror attack since the 1988 Lockerbie bombing. - 10 rucksack bombs tore through four packed commuter trains.

Many people believe the attack changed te result of the Spanish general election held three days later.
The PP blamed ETA. Security investigators blamed an cell supporting al-Qaeda, that had no direct links to the terror organisation, they had acted to avenge the presence of Spanish troops in Iraq and Afghanistan, said investigators.

The public believed the investigators. The PSOE beat the conservative PP.