Iran ceasefire collapses, cancer blood tests, the children of Venezuela, and more

U.S. President Donald Trump says the ceasefire between Iran and the U.S. is over. Both countries are trading fire again, in the worst clashes since the two countries signed an agreement to stop fighting last month.And: For cancer survivors, the lingering fear of recurrence never truly fades. A new technology is helping find the tiniest traces of cancer using basic blood work.Also: Weeks after tens of thousands of lives were shattered by the earthquakes that rocked Venezuela, the country’s children face a fragile new reality. CBC is in Venezuela.Plus: Researchers get a look at Shackleton’s last ship — the Quest, more details on charter boat tragedy in B.C., the heat is back in Western Europe, and more.