Fort Collins police say they used tear gas to disperse a large and noisy street party near the Colorado State University campus as some revelers threw bottles at officers.
Pakistani Taliban detonated bombs at the campaign offices of two politicians in the country's northwest on Sunday, police said, killing at least nine people in an escalation of attacks on secular, left-leaning political parties.
The arrest of a 41-year-old Mississippi martial arts instructor in a case of poison-laced letters sent to President Barack Obama and others capped a week in which investigators initially zeroed in on a rival of James Everett Dutschke, then decided they had the wrong man.
Israel responded to rockets fired from the Gaza Strip with airstrikes on sites used by Islamic militant group Hamas, which rules the Palestinian territory, the military said on Sunday.
A remote-controlled roadside bomb killed three police officers in eastern Afghanistan on Sunday, an attack the Taliban claimed as the opening round of their spring offensive.