Public opinion may have moved towards a Brexit vote, according to two new polls conducted by ICM.
Working with The Guardian, the pollster conducted both online and telephone polls, with respondents split 52-48 in favour of a vote to leave.
While those surveyed over the phone were more likely to respond that they "didn't know" how they would vote in late June, both polls show a lead for the Brexit campaign.
It comes after a separate poll also showed a dramatic reduction in the size of the Remain camp's lead, while bookmakers have also acted to reduce the odds on a Leave vote.
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In a phone poll of more than 1,000 adults, 45 per cent said they favoured a vote to leave, while 42 per cent backed a vote to remain.
47 per cent of online respondents said they would like to leave, compared to 44 per cent who said they would vote remain.
The figures represent a dramatic swing on a similar ICM poll conducted in mid-May, which found a ten per cent lead for the remain camp on phone polling, while online surveys turned up a 52 per cent lead for Brexit.