More than 10,000 marchers poured onto the streets of Casablanca, Morocco's largest city and main port, on Sunday.
The demonstrators condemned the relocation of the US embassy. They said the holly city would remain the eternal capital of Palestine.
The angry protesters chanted slogans such as "Death to Israel" and carried Palestinian flags and placards that read "Al-Quds (Jerusalem) Palestine's eternal capital".
The demonstrators also reaffirmed support for the Palestinians' struggle to attain their legitimate rights, including their right to return to their homeland and establish their independent state.
The Casablanca protest had been organized by a coalition of four parties including the Islamic opposition group al-Adl Wal Ihsan, which is seen as Morocco's most powerful group in terms of rallying supporters on the street.
At least 65 Palestinians were killed and more than 2,700 others wounded near the Gaza fence on the eve of the 70th anniversary of Nakba Day, which coincided this year with the relocation of the US embassy.
