Tehran has not explained why or when it detained Robin Shahini during a visit to Iran.
Environmentalists and Bernie Sanders supporters rally in Philadelphia ahead of the Democratic convention.
Debbie Wasserman Schultz will leave after leaked emails suggest her staff tried to discredit Bernie Sanders's campaign.
The IOC was investigating the Russian team after allegations of widespread state-sponsored doping in 2014.
The teen attacker, identified as David S., took photos at the site of a school shooting in Germany.
Detectives investigate the scene as fires raged in tinder-dry California hills and canyons.