Hamas and Iran could pose a threat on the streets of the UK, government anti-extremism tsar to warn

He will add in his speech at the Royal United Services Institute in Whitehall, central London: 'Terrorist attacks on Israel are seen as not only more justifiable than attacks on other countries, but, to some, a cause for celebration. 'Too often, support for Palestinian rights has translated into rhetoric supportive of Hamas. Too many in positions of prominence have praised them or their leadership or sought to rationalise or excuse their acts of terror.' Mr Simcox, who was previously director of think-tank the Counter Extremism Group, is expected to urge ministers to 'have the confidence and will to commit to a long-term strategy for taking on extreme ideologies'.