Image caption Volunteers at the Blaenau Gwent food bank, which has five distribution points

The number of people using food banks in Wales has continued to rise, according to latest figures for 2014.

In the six months to September, 39,174 people were given three days' emergency food from the network of centres run by the Trussell Trust.

This is a 20% rise on the same period in 2013.

But the Department for Work and Pensions (DWP) said there was "no convincing evidence" linking benefit changes and more use of food banks.

Image caption Map showing food bank referrals across Wales - they include new centres in Narberth, Pembrokeshire and Monmouth

How do food banks work?

Those in crisis have to be referred from to them by doctors, health visitors, job centre, social workers, Citizens Advice Bureaux and police.

Non-perishable food is donated by members of the public at collection points or through schools, churches and businesses.

Those identified as needing help are issued with a food bank voucher for three days worth of food.

The Trussell Trust estimates more than 65% of users were only helped once over a six-month period, and only 7.5% needed four or more vouchers.

Volunteers can also direct people to agencies to help them solve longer-term problems.

Source: Trussell Trust

CASE STUDY: EBBW VALE

Image caption Martin Abel has been running the Blaenau Gwent food bank since April

The Blaenau Gwent food bank runs from a church in Ebbw Vale twice a week and was the first to open in Wales in October 2008.

It has helped just over 1,500 people from April to September 2014. This is about 200 fewer people than the same period last year but compares to 900 in April to September 2012.

Martin Abel, food bank manager, said: "All food bank vouchers are numbered and people are allowed up to three so we notice if a pattern is emerging we put them in touch with agencies and find help, whether it's with budgeting or whatever."

Read more - Blaenau Gwent food bank finds goodwill in troubles

In Wales, those helped included more than 13,200 children.

The most common reasons for seeking help are benefit delays, low income and benefit changes.

Oxfam Cymru has blamed a "perfect storm" of "benefit cuts, low wages, sanctions and insecure jobs".

But Works and Pensions Secretary Iain Duncan Smith has said it was "quite wrong" to suggest it was just to do with benefits-related problems.

The DWP has consistently claimed welfare changes are not to blame.

A spokesman added: "The reality is the vast majority of benefits are processed on time, with improvements being made year on year.

"And we continue to spend £94bn a year on working age benefits to ensure there is a strong safety net in place."