North Korea's foreign minister has accused US President Donald Trump of declaring war on his country.
Ri Yong-ho told reporters in New York that North Korea reserved the right to shoot down US bombers.
This applied even when they were not in North Korean airspace, the minister added. The world "should clearly remember" it was the US that first declared war, Mr Ri said.
The two sides have been engaged in an increasingly angry war of words.
Despite weeks of tension, experts have played down the risk of direct conflict between the two.
After Mr Ri addressed the United Nations on Saturday, the US president responded by tweeting that Mr Ri and North Korean leader Kim Jong-un "won't be around much longer" if they continued their rhetoric.
Mr Ri's response came as he was leaving New York, following the UN General Assembly.
"In light of the declaration of war by Trump, all options will be on the operations table of the supreme leadership of the DPRK [North Korea]," he added.
North Korea has continued to carry out nuclear and ballistic missile tests in recent weeks, in defiance of successive rounds of UN sanctions.
The country's leaders say nuclear capabilities are its only deterrent against an outside world seeking to destroy it.
After the North's latest and most powerful nuclear test earlier this month, the UN Security Council approved new sanctions on the country.
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