Commenting on calls for Europe to pull together without any analysis of how yesterday's Brussels atrocities were able to happen, Leave.EU co-Chairman, Arron Banks, said:
"EU supporters like Hugo Dixon have already jumped on the horrific events in Brussels to claim that they help make the case for staying in the EU, but nothing could be further from the truth.
"The Government's official report on Free Movement in 2014 conceded that it is 'extensively exploited' by organised criminals to bring arms, drugs, human trafficking victims and illegal immigrants into the UK, and what goes for organised crime goes for organised terror, too.
"There's virtually nothing we can do to stop every Islamist sympathiser in Molenbeek from setting up shop in the UK if they so choose, provided they can flash an EU passport on their way in. Many of them are already EU citizens anyway.
"David Cameron is actively campaigning to 'pave the road from Ankara to Brussels' for Turkey to join the EU and the hundreds of thousands of migrants invited into Europe by Angela Merkel are only a few years away from winning full citizenship, so the danger to the British public will only grow over time.
"Being outside the Schengen Area is no protection. The political and media elites sneer that this is not the time for making political points, but this threat is a consequence of their political indecision.
"When will it be time to take our heads out of the sand and hold them to account? After the referendum, when it's too late to change direction, and we see blood on British streets again?"
"With the EU already poised to extend visa-free travel to an increasingly aggressive and radicalised Turkey and a war-torn Ukraine, it's clear that lessons are not being learned.
"Brussels, the so-called capital of the EU, has taken the grand experiment in state-sponsored multiculturalism and tested it to destruction. The ghettos and extremism are proof this doesn't work.
"An American politician once said that 'immigration without assimilation equals invasion' – and he was right."