Senator Marco Rubio announced to donors Monday that he is launching a U.S. presidential campaign, becoming the latest -- and youngest -- Republican in the race to succeed Barack Obama in the White House.

U.S. media reported that Rubio told major donors on a conference call about his plans, hours ahead of a glitzy launch event in Miami where he is expected to present himself as the next-generation candidate in the candidate.

An official says one person is dead and a North Carolina community college campus is on lockdown as authorities search for a man with a gun.

Kim Best, spokeswoman for the city of Goldsboro, says there is one victim in the campus shooting at Wayne County Community College. She says that person is dead but did not give any other details.

Hillary Clinton launched her bid Sunday to become the first woman to win the White House, and announced a campaign tour to showcase her support for "everyday Americans."

"I'm running for president," Clinton, a former secretary of state and U.S. first lady, said in a video on her campaign website that went live at about 3:00 pm (1900 GMT) Sunday.

Secretary of State John Kerry will this week defend an emerging deal intended to curb Iran's nuclear ambitions, urging skeptical U.S. lawmakers not to put up obstacles that could scupper the tough negotiations.

"I'll lay out the facts," Kerry told CBS' "Face the Nation" on Sunday when asked about a different narrative emerging from Iranian leaders about the outlines of a deal agreed in Lausanne, Switzerland earlier this month.

U.S. President Barack Obama and Cuba's Raul Castro heralded a new era of bilateral relations on Saturday as they both addressed a landmark Summit of the Americas ahead of historic one-on-one talks.

Sitting around an oval table with some 30 other regional leaders in Panama City, Obama and Castro spoke one after the other in an unprecedented public exchange between the leaders of the Cold War-era foes.

A delegation of Libyan lawmakers recognized by the international community will head to Washington next week as part of U.N. efforts to create a stable unity government in the war-torn country, the U.S. State Department said Friday.

"We look forward to discussing their work with the U.N. Special Representative (Bernardino) Leon in support of the U.N.-led process to constitute a national unity government," State Department spokesman Jeff Rathke said about the delegation from Libya's House of Representatives.

U.S. Secretary of State John Kerry urged Beijing on Friday to immediately release five feminists who were detained ahead of International Women's Day.

The arrests last month appeared to be an effort by China to head off public protest linked to the March 8 holiday.

A top U.S. diplomat met with Venezuelan President Nicolas Maduro earlier this week in Caracas, Washington announced, after tensions flared between the two governments in recent weeks.

The meeting with U.S. State Department Counselor Thomas Shannon occurred Wednesday, an agency spokesman said, the same day the advisor met with Venezuelan Foreign Minister Delcy Rodriguez.

Ten sheriff's deputies involved in the violent arrest of a suspect on horseback in California have been put on leave after being caught on video kicking and beating the man repeatedly, officials said Friday.

San Bernardino County sheriff John McMahon said he was "disturbed" by footage of the arrest of Francis Jared Pusok, 30, a white male with a lengthy criminal record.

Chile introduced regulations Friday making it the first country in Latin America to officially allow drone flights.

The measure regulates both the public and private use of drones, remote-controlled aircraft whose use has skyrocketed in recent years for uses ranging from military airstrikes to delivering mail.