PYONGYANG, May 12 (Xinhua) -- The Democratic People's Republic of Korea (DPRK) Friday slammed the United States Congress for passing a new law to tighten sanctions against the DPRK.

The Foreign Affairs Committee of the Supreme People's Assembly of the DPRK has sent an open letter of protest to the U.S. House of Representatives, strongly condemning and resolutely rejecting the "North Korea Interdiction and Modernization of Sanctions Act" passed last week, said the official Korean Central News Agency.

"The passage of the above legislation amounts to the most heinous act against humanity, not only infringing upon the sacred sovereignty of the DPRK but also arbitrarily violating universal principles of sovereignty, equality and non-interference in the internal affairs of other countries," the letter said.

The law is another example of the United States using domestic laws to "meddle in other's internal affairs and bring pressure to bear on another country," it said.

The DPRK legislature also pointed out that the hostile actions by the United States "will further handicap the U.S. in its attempt to resolve the nuclear issue (of the Korean Peninsula)."

"As the U.S. House of Representatives enacts more and more of these reckless hostile laws, the DPRK's efforts to strengthen nuclear deterrents will gather greater pace, beyond anyone's imagination," it added.