Trade Me crashed this morning, causing the online auction site to extend thousands of affected auctions.

The site began experiencing technical issues around 11am before it was taken down as a precaution at 11.58am.

It was back up and running by 1pm.

Affected auctions that were due to close between 11am and 1.30pm - totalling 38,903 listings - have now been extended by five hours.

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"The issue was to do with the way our data is synchronised inside Trade Me,'' a spokesman said.

"We're sorry for any inconvenience to our members.''