Jacobo Israel, president of Madrid's small Jewish community, said this would be the first time that a Jewish site in Spain had been threatened by Islamic extremists, but that the news did not come as a surprise.
"We always thought we were a target and I think this just confirms the reality," he said in a telephone interview.
Investigators have drawn no concrete link between the Madrid train bombings and attacks against five targets last May in Casablanca, Morocco, in which 47 people, including 12 suicide bombers, were killed. However, one of the places attacked was a Jewish cemetery; another was a Jewish community center; a third was the Casa de Espana, a Spanish-owned restaurant and social club.



