Britain may have to "revisit" its position on Iraq if the threat to national security becomes too much.
Former Army officer Col Bob Stewart MP told ITV News: "Things happen and circumstances change, and if our country is threatened by people from the Islamic State, our national interest, our people are threatened, we may well have to revisit that situation."
ITV's Deputy Political Editor Chris Ship reports:
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Ciaran Williamson and two friends were hit by the gravestone while playing in Craigton cemetery in the Cardonald area of Glasgow.
Attorney General Loretta E. Lynch spoke at a press conference earlier following arrests made in Zurich.