A new opinion poll suggests that Sinn Féin has increased its support once again and is now tied in first place with Fianna Fáil.

The Business Post/Red C survey of 1,000 voters indicates that Fine Gael is now lying in third place - the first time in this series of Red C polls that Sinn Féin has ever registered a higher level of support than Fine Gael.

The poll, which was taken over six days up to last Thursday, indicates that Fianna Fáil is on 24% support - a drop of two points on the last comparable poll earlier this month.

The biggest shift in support is for Sinn Féin, which is up five points to 24% - and follows an eight point increase in the previous poll.

Fine Gael drops two points with party's support now gauged at 21% - that follows a seven point drop in the last poll.

The Green Party is down one to 7%, while Labour is up one to 5%.

Independents are down two to 12%.

The Social Democrats are unchanged at 3%, with Solidarity-PBP down one to 1%.

Aontú is on 2% support according to this poll - up one point.

Other parties are listed as having 1%.

There is a margin of error associated with this poll of plus or minus 3%.