Executives of the National Asset Management Agency (NAMA) are being probed by the Public Accounts Committee (PAC) over its "miniscule" level of support for social housing.

Mary-Lou McDonald of Sinn Féin says she doubts that the agency is "very serious" about its social objectives as was claimed by NAMA chief executive, Brendan McDonagh.

The agency has offered over 4,500 houses for social housing over the past two years, many of which have been rejected by local authorities.

It has also emerged that local authorities are being re-offered properties from the Agency that they have already refused for social housing.

Councils turned down over one-third of the properties offered by NAMA, because they were deemed inappropriate for social housing.

But they are now taking a second look at 500 of them given the increased threat of homelessness.

Brendan McDonagh says NAMA is committed to relieving the housing crisis but Mary-Lou McDonald says she is not convinced.