Policemen guard while passengers pass in a subway station in Washington DC in the United States July 7, 2005. The public transit passengers are required to report all the suspicious actions and the subway systems, along with all bus stations, are under intense supervision after the serial bomb blasts happened earlier in the day in London which killed at least 33 people and injured 400. (Xinhua Photo)

    Beijing July 9 -- Nations around the world have tightened security after the string of deadly bombings which rocked London on Thursday.

    Related news photos: World on terror alert

    Governments in Europe, Asia and the Americas have ordered tighter patrols on subways, airports and railway stations.

    A group calling itself the Organization of Al-Qaeda Jihad in Europe, which has claimed responsibility for the bombings, immediately threatened similar attacks in Denmark, Italy and other countries with troops in Iraq and Afghanistan.

    European Union interior ministers say they will hold an extraordinary meeting in Brussels on Wednesday to discuss mooted anti-terror legislation.

    France has deployed military reinforcements to sensitive sites across the country, including train stations and airports.
In Spain, where 191 people were killed in a series of train bombings on March 11 last year, security forces patrolled communications centers, stadiums, shopping malls, power stations and water facilities.

    In the Greek capital Athens, metro operators have jammed mobile phone networks as a security precaution, effective until Saturday.

    Transport officials in Berlin raised their security alert to mid-level as German Interior Minister Otto Schily urged increased vigilance.

    Other countries are also beefing up security. Russia, the Netherlands, Israel, Belgium, the Czech Republic, Romania and Serbia stepped up their precautions; as did Asian nations including South Korea, Thailand and India.

    The United States raised the threat level to code orange or "high" for trains, subways and buses. US Secretary of State Condoleezza Rice also ordered US embassies around the globe to review their security procedures.

    (Source: CRIENGLISH.com)