Five NATO troops died in a helicopter crash this morning in southern Afghanistan, marking the deadliest single day of 2014. The Taliban is taking credit for the strike.

CBS News Afghanistan Consultant Jere Van Dyk says the Taliban is sending a message: 'It shows that the Taliban are very anxious to prove they are still in power, that the election - which they call 'the institution of the western religion of democracy' in their view - that they are still very much a factor; that they are going to be a factor.' 

Today's deaths bring the number of international troops killed this month to seven. NATO force is preparing to withdraw its troops from Afghanistan at the end of this year, and has already turned over the job of fighting the Taliban insurgency to the Afghan army and police.