A car bomb has exploded in a business park in Madrid, without causing any casualties or injuries according to emergency services.The blast occurred at nine o’clock this morning. A telephone warning had been made an a hour and a half earlier, giving police time to locate a suspicious vehicle and clear the surrounding area. One local resident said: “I saw a lot of smoke after a horrible noise and I was very scared. Then we were evacuated.” Authorities are blaming Basque separatist group ETA for the attack. The blast struck outside the offices of a railway construction company that ETA has previously said it would target. Yesterday Spain’s Supreme court banned two Basque pro-independence parties because of their alleged links to ETA. They will not be allowed to take part in regional elections in March.