BBC News
The Italian-American film star was due to receive Milan's highest honour, the Golden Ambrosius award, from the city's mayor on Thursday.
He also failed to appear at a press conference for the New York Tribeca film festival in Rome on Friday.
In a statement issued by his publicist in Los Angeles, De Niro, 61, blamed "serious communication problems".
"It was a complicated situation, and I'm not sure how it was handled at their end, but it certainly wasn't handled properly at mine," said the star of films such as The Godfather Part II and The Untouchables.
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