Kolbeinn Sigthorsson grabbed a 90th-minute equaliser to earn AZ Alkmaar a 2-2 home draw with Heerenveen.

Pontus Wernbloom had given AZ a seventh-minute advantage, but second-half goals from Mika Vayrynen and Daryl Janmaat looked to have given the visitors the points.

Sigthorsson had other ideas, though, and earned his side a point that moves them into fourth in the Eredivisie.

AZ started well and got their opener on the back of some solid approach play, with Wernbloom taking in a Nick Viergever pass and slotting home.

Heerenveen responded with Roy Beerens laying on a chance that Viktor Elm failed to connect with, while at the other end, Rasmus Elm went close with a curling effort.

The chances continued to arrive at both ends, and Heerenveen's Oussama Assaidi took aim from distance after a mazy run, forcing Sergio Romero to palm the ball wide.

AZ looked to double their lead before the break, with Brett Holman going close from six yards after a Maarten Martens cross, but it was Heerenveen who scored next, levelling seven minutes after the break.

A long ball into the box was flicked on by Bas Dost, Elm took aim and hit the post, with the rebound falling kindly for Vayrynen who made no mistake from close in.

The chances dried up somewhat after that, but the next opening had the same result as the visitors went ahead.

Janmaat took the ball on the right wing, cut inside and unleashed an unstoppable drive that looked to have won it for Heerenveen.

That would have been beyond doubt had Dost not shanked a volley over minutes later, and Sigthorsson made him pay as time ran down as he picked up Graziano Pelle's pass to bundle the ball home.