It requires operational planning and expensive defence commitments.

它需要行动计划和代价高昂的防御承诺。

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In a statement to the BBC, police said the search strategy is under review and that all new searches are subject to weather conditions, availability of resources and operational commitments.

BBC: Arkinson family criticise police search

The chair of the council, Richard Thomas, has said the organisation has met its operational commitments since 2010 despite reduced resources and uncertainty over its future has left it "fragile and frustrated".

BBC: MPs call for 'vital' quango to be reprieved