U.S. says U.N. sanctions ‘will bite’ after North Korea threatens nuclear attack

Updated 10:05 PM EST, Thu March 7, 2013

Story highlights

NEW: U.S. Ambassador Rice: The sanctions will "bite hard"

NEW: China is "firmly committed" to peace on the Korean peninsula, ambassador to U.N. says

NEW: The resolution will clamp down on North Korea's officials, banks and cargo

Analysts say China is a key to determining whether the sanctions deter North Korea