The gap between the number of people in the UK who want to remain in the EU and those who want to leave is narrowing, a ComRes poll for ITV News suggests.
Forty-eight per cent of those questioned said they want to stay part of Europe while 41% said they want to leave - a gap of seven points and the lowest lead yet. This compares with an eight point lead in a ComRes poll for ITV News in February.
The number of people undecided over how they plan to vote stands at 11%.
The poll was conducted before the attacks in Brussels on Tuesday.
The latest poll also suggests that for one in three Britons, Prime Minister David Cameron is the most influential politician in deciding how they will vote in the referendum, followed by Boris Johnson (29%) and Jeremy Corbyn (24%).
In terms of risk to the UK economy if Britain leaves the EU, 69% said leaving is a big risk or a slight risk to the British economy, compared with 52% who believe that staying in is more of a big risk/slight risk.
Question: If a referendum were held tomorrow on the UK’s membership of the European Union (EU), how would you vote on the following question? “Should the UK remain a member of the European Union, or leave the European Union?”
Question: Have you definitely decided which way you will vote at the referendum or may you still change your mind?
Question: Who of the following, if any, will be important to you in deciding how you will vote at the upcoming referendum on Britain’s membership of the European Union?
Nigel Farage (18%), Nicola Sturgeon (15%), Michael Gove (13%), Other (1%), None (31%) and Don't Know (2%).
Question: How much of a risk, if any, do you think there is to the British economy if…
72% of people who voted for the Conservatives in 2015 say leaving the EU is a risk to the economy, compared to 59% who say remaining is a risk.
ComRes interviewed 1,002 British adults aged 18 and over from 18th-20th March.