Vunipola penalised for blocking. Myler finds touch inside Saracens' 22.

Ma'afu pinged for a late tackle. Saracens go down the line.

Myler gets the second half underway.

Half Time! Saints' maul collapses and the referee blows it up to end the half. After a thrilling half of rugby, it's Saracens that edge the lead 17-13. There is very little separating these two sides after 40 minutes and it looks set to be a close encounter for the second half also. Injury concerns for Saracens, with Billy Vunipola being forced to come off with an ankle injury and also sub Jackson Wray getting stretchered off with a head injury. Stay tuned for live updates of what should be a thrilling second half of rugby.

Looked bad, hope it's nothing serious

Best wishes to Jackson Wray

Substitute Jackson Wray is down with a head injury.

Think USA need 7 of him 7 Manoa's and Hamlin can finish the 15 then maybe they will get to the finals stages.

Twisted knee and ankle.

Good positioning by Ken Pisi. The winger places one foot in touch as he collects the clearance kick. The line out is brought back to inside Saracens' half.