The activity comes at a time of heightened tensions as talks between Iranian and US officials continue over Iran's nuclear programme.

The activity comes at a time of heightened tensions as talks between Iranian and US officials continue over Iran's nuclear programme.

The International Olympic Committee defends the T-shirt as being part of its Heritage Collection, celebrating styles from all editions of the Games.

The International Olympic Committee defends the T-shirt as being part of its Heritage Collection, celebrating styles from all editions of the Games.