Major U.S. cities raise vigilance

No immediate plans to raise threat level

FOR U.S. CITIZENS

The Bureau of Consular Affairs has set up a call center for inquiries on U.S. citizens in London who may have been affected by the blasts. The call center number is 1-888-407-4747. So far, the bureau has no information about any American citizens injured or killed.

• Blasts rock London

• List of security measures

• Capitol Hill security tightened

YOUR E-MAIL ALERTS

WASHINGTON (AP) -- The Homeland Security Department asked authorities in major cities Thursday for heightened vigilance of major transportation systems after a series of explosions on London transit systems.

Department spokesman Brian Roehrkasse said, however, that there were no immediate plans to raise the nation's threat level.

"We do not have any intelligence indicating this type of attack is planned in the United States," Roehrkasse said.

The Homeland Security Department asked authorities in major cities for "continued vigilance" of their transportation systems, Roehrkasse said.

In the nation's capital, bomb-sniffing dogs and armed police officers were patrolling subways and buses and looking for anything suspicious. Passengers were being urged to report any suspicious activity. About 1.2 million people a day ride Washington's buses and trains.

Other major cities also heightened security on transit systems. (Full story)

In Los Angeles, a police official said police had activated a special command center and officials were meeting to decide whether to upgrade security levels around the city.

A spokeswoman for the Chicago Transit Authority said transit officials were working with Chicago Police on additional security measures.

CTA spokeswoman Kimberly Myles said announcements were being made to riders to be aware of their surroundings and to alert transit workers about suspicious packages.

Similar announcements were made in Cleveland, Ohio, and several other cities.

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