Kevin Jones, arson reduction manager with North Wales fire service, appealed to parents to be aware of "the whereabouts of their children and impress upon them the message that deliberate fires endanger lives".

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He said, however, that if banks and other trading firms felt that opening would endanger lives, or that the stability of the market was uncertain due to routing of NYSE orders, Nasdaq would support a consensus to close.

WSJ: Behind Decision to Close Markets

But some argue it casts doubt on their objectivity and could endanger their lives.

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Family members have also expressed concern that a military operation would endanger the lives of the captives.

NPR: No Word on Korean Hostages as Deadline Passes

Striking a defiant tone, Mr Obama said leaks to news media could endanger the lives of military and intelligence personnel.

BBC: Obama tries to tame political tempests

Instead, WWF believes that such a move would only further endanger the lives of rhino - and possibly drive them to extinction.

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"If the life of one animal may endanger other lives or human lives as well, then we must take into account the greater good and sacrifice the individual good, " he said.

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The agency "remains gravely concerned about the safety of the Palestine refugee population in Syria and appeals to all parties to refrain from actions that endanger civilian lives and property, " it said.

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"As the last line of defence in the cabin and key aviation partners, we believe that these proposed changes will further endanger the lives of all flight attendants and the passengers we work so hard to keep safe and secure, " the group said in a statement.

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