Watch: BBC on streets of Mexican city gripped by deadly cartel violenceWarning: This video contains graphic imagery of the victims of stabbings and shootings, as well as images of those killed in street violenceOne of the most powerful and feared criminal organisations in Mexico has unleashed a wave of violence across 20 Mexican states, following the death of drug lord Nemesio Oseguera...

Mother arrested after boys abandoned by road in PortugalGetty ImagesThe children were found by a driver in Alcacer do SalThe mother and stepfather of two young French boys found alone and in tears by the side of a road in southern Portugal have been arrested. The children - both under five - were found by a driver near the town of Alcacer do Sal on Tuesday, police said. They were carrying...

Why do gray whales keep dying in San Francisco's waters?Why are gray whales dying in San Francisco's waters? US scientists search for cluesKathi George / The Marine Mammal CenterAn adult female dead gray whale floated into the San Francisco Bay in California in March.California's blustery San Francisco Bay is home to the Golden Gate Bridge, commercial ports, public marinas and ferry boats. But...

Watch: Moment gunman tackled by school principalCCTV footage shows the moment a high school principal tackles an active shooter in Oklahoma.The suspected gunman, Victor Hawkins, walked into Pauls Valley High School and fired shots during the incident on 7 April.Principal Kirk Moore, is then seen charging toward the former student and tackling him, before another staff member arrives and removes...

Ontario Premier Doug Ford agrees to sell $21m private jet following outcryGetty ImagesThe Canadian province of Ontario is now selling a jet recently bought for Premier Doug Ford, after he faced criticism for the purchase of the private, pre-owned jet for C$28.9m ($21m; £15.5m).Ford's office had said he would use it for official travel, including to the US to advocate against the Trump...