Scientists at the National Centre of Cardiovascular Research in Madrid, Spain, studied 811 patients who were admitted to hospital with heart attacks between 2003 and 2009.

西班牙马德里的国家心血管研究中心科学家研究了811个2003年到2009年因心脏病发作送到医院的患者。

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This week's attacks on London, following similar attacks on Madrid in 2004, have raised new questions in Europe about the consequences of supporting US policies in Iraq and in the war on terror.

NPR: Evaluating the Attacks' Effects on U.S. Allies

Reinares, who became a senior adviser on counter-terrorism in the Spanish government after the attacks, writes that when the Madrid cell was dismantled in 2001, there was insufficient evidence to prosecute at least three men.

CNN: France asks: Were warnings missed on Toulouse killer?

There's not always a claim of responsibility in attacks like this, but this does follow the pattern of Madrid in 2004.

NPR: Investigators Cautious on Assessing Blame for Attacks