Governments and nations the world over are facing a "common enemy" in terrorism, AFP quoted US Secretary of State Hillary Clinton saying following Monday's deadly attacks in Moscow.
"I think there is a connection between most of the terrorists' activities that we're seeing around the world. They get encouragement from each other, they exchange training, explosives, information," said Clinton, who is attending a foreign ministers G8 conference on global security.
Earlier Monday US President Barack Obama said the American people stand united with the people of Russia in opposition to violent extremism and "heinous" terrorist attacks.
In a phone call to President Medvedev to offer condolences following the attacks, President Obama went on to say that "the United States was ready to cooperate with Russia to help bring to justice those who undertook this attack," the White House said in a statement quoted by Reuters.