Iran blacks out social media as President Rouhani slams Trump in address to
his nation after defiant protesters face water cannon and hundreds of arrests
on the fourth day of demonstrations

     * Rouhani hit back at Donald Trump saying he had called Iranians
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   Tehran, said 80 people had been detained there overnight.

   A fourth day of demonstrations saw crowds take to the streets to light
   fires on the streets and shout 'death to the dictator' with water
   cannon used on a crowd in Tehran.
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   The demonstrations were fanned in part by messages sent on the Telegram
   messaging app, which authorities blocked Sunday along with the
   photo-sharing app Instagram, which is owned by tech giant Facebook.
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   Despite the online crackdown more footage emerged on Sunday showing
   demonstrations spreading to the cities of Sanandaj and Urmye in
   Kurdistan Province.

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   Marchers also gathered outside the Iranian embassy in west London on
   Sunday to call for an end to the regime
   The demonstrations started on Thursday over the country's flagging
   economy, but have since spread (pictured, marchers in west London)
   The demonstrations started on Thursday over the country's flagging
   economy, but have since spread (pictured, marchers in west London)

   The demonstrations started on Thursday over the country's flagging
   economy, but have since spread (pictured, marchers in west London)
   Opponents of President Hassan Rouhani gathered in London to make their