A female suicide bomber is suspected of carrying out the attack on a bus in southern Russia, according to news agency Interfax citing Russian investigators.
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A 14-year-old boy has reportedly been arrested in Saudi Arabia after dancing the Macarena in the street.
Another American city is hit by political turmoil as police use tear gas to disperse protesters at a rally in Phoenix, Arizona.
Kim Wall, whose body had been cut apart, is believed to have died while on a privately built submarine belonging to a Danish inventor.