Braving rain and an extremely muddy pitch, the Prime Minister - who said he used to play the position of hooker - passed a rugby ball around with children who were having a taster session at Millwall Rugby Club in east London.
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Cool temperatures and breezy conditions with a top temperature of 20 Celsius (68 F).
Suicide bombers targetting Istanbul's airport incited panic to take lethal advantage in an attack that echoed the Brussels airport atrocity.
Brad Treat, 38, was killed on a trail in the Halfmoon Lakes area of the Flathead National Forest, just outside Glacier National Park.