Crossword Puzzle Serious threat

Clue: Serious threat

___-Obama Proliferation and Threat Reduction Initiative (2007 law) (LUGAR with 5 letters)
Former Atlantic ocean threat (UBOAT with 5 letters)
In a threatening fashion (OMINOUSLY with 9 letters)
Canine threat (GROWL with 5 letters)
Reacts to a threat (TENSES with 6 letters)
Threatening "meal" (KNUCKLESANDWICH with 15 letters)
End of a vague threat (ELSE with 4 letters)
Least compelling, as a threat (EMPTIEST with 8 letters)
Threatened, in a way (SNARLEDAT with 9 letters)
Uncovered threats? (ACTSOFGOD with 9 letters)