None of the American crew were hurt, but rescue parties are searching for the Chinese pilot whose whereabouts are not known.
He said there was no legal basis for this, and described it is "inexplicable and inexcusable".
The Americans say the aircraft - an EP-3 surveillance plane - is sovereign US "territory" and should not be boarded by Chinese officials.
The American plane, which is packed with sensitive monitoring equipment, is now on the southern Chinese island of Hainan.
Strong words
In an escalating row over the incident, the commander of the US Pacific military forces rejected Beijing's claim that the American plane rammed the Chinese jet on Sunday and caused it to crash.
Admiral Dennis Blair said that in fact the Chinese planes were at fault and sharply criticised China for more "aggressive" tactics in intercepting US planes.
"It's not a normal practice to play bumper cars in the air," he said.
US military officials have warned the Chinese not to "seize, board or inspect" the plane without US permission.
None of the American crew were hurt, but rescue parties are searching for the Chinese pilot whose whereabouts are not known.
Admiral Blair said that US officials had had no contact with the crew since its initial report that it landed with no injuries.
"We just don't know" what has happened to them, Admiral Blair said.
As American officials travelled to Lingshui military airport, on Hainan Island, US Lieutenant Commander Sean Kelly acknowledged that Chinese officials might refuse to see the delegation.
Analysts have said Beijing's statements over the collision are among the strongest heard for almost two years and say the standoff could be a long one.
'Proper arrangements'
China's Foreign Ministry has said that "proper arrangements" had been made for the crew, but did not say where they were.
The ministry has put all the blame on the US aircraft for causing the collision.
''A Chinese aircraft was conducting normal flight operations 10km (6 miles) south of Hainan Island when a US plane suddenly veered towards it,'' Chinese state television quoted the Foreign Ministry as saying.
The ministry said it had lodged a protest with US authorities and reserved the right to seek damages.
The BBC's correspondent in Washington, Richard Lister, says the US is moving swiftly to try to defuse what could become a major diplomatic row.
Experts say run-ins between Chinese and US aircraft are quite common along the Chinese coast, although it was the first time an aircraft had made an emergency landing.
"It's very regular for the American navy to have their planes intruding into Chinese airspace," Yan Xuetong, an international studies expert at Beijing's Tsinghua University said.
"The Chinese then send up fighters and chase them out."
It comes at a time when Sino-American relations are under increasing strain.
US plans to develop a national missile shield - the so-called "son of star wars" - are a particularly contentious issue.