LAS VEGAS, Nev. - Republican presidential front-runner Mitt Romney looked to caucus contests in three more states this week hoping to solidify the growing sense of inevitability surrounding his candidacy to challenge President Barack Obama in the November election.

OTTAWA - Foreign Affairs Minister John Baird invoked images of the Holocaust in defending the notion of possible Israeli military action against Iran.

GRAHAM, Wash. - Days after a judge ruled against him in a child custody hearing, a father and his two young sons were killed Sunday when police said he appeared to intentionally blow up a house with all three inside — a tragic ending to a bizarre case that began more than two years ago when the man's wife went mysteriously missing in Utah.

NEW ORLEANS - A stomach virus outbreak delayed the departure of the cruise ship "Voyager of the Seas" from New Orleans in one of three outbreaks of illness aboard U.S.-based cruise ships reported over the weekend.

WASHINGTON - President Barack Obama said Sunday he does not think Israel has decided whether to attack Iran over its disputed nuclear program, a standoff that has the Middle East on edge.

JERUSALEM - For the first time in nearly two decades of escalating tensions over Iran's nuclear program, world leaders are genuinely concerned that an Israeli military attack on the Islamic Republic could be imminent — an action that many fear might trigger a wider war, terrorism and global economic havoc.

MAKKOVIK, N.L. - The family of a 14-year-old boy whose body was found off the coast of Labrador says poor decisions were made in the search for him and the response to requests for help has to be improved to prevent future tragedies.

MONTREAL - Facing pressure from conservation groups, Quebec Premier Jean Charest has promised to increase the number of protected areas in the province's northern development plan.

BEIRUT - The United States proposed an international coalition to support Syria's opposition Sunday after Russia and China blocked a U.N. attempt to end nearly 11 months of bloodshed, raising fears that violence will escalate. Rebel soldiers said force was now the only way to oust President Bashar Assad, while the regime vowed to press its military crackdown.

OTTAWA - Stephen Harper has called a byelection for March 12 in former NDP leader Jack Layton's riding.