"First we, in the diaspora, need to amplify the voices of protesters on the ground", he told VOA, adding that, "we need to empower people so that can sustain their demands against the Iranian regime".
Flowers and candles are placed in front of the portraits of the flight crew members of the Ukraine International Airlines Boeing 737-800 plane that crashed in Iran, at a memorial at the Boryspil International airport outside Kiev, Ukraine January 11, 2020.
Videos sent to the New York-based Center for Human Rights in Iran and later verified by The Associated Press show a crowd of demonstrators fleeing as a tear gas canister landed among them.
Riot police, members of the elite Revolutionary Guard on motorbikes, and plainclothes security officials were out in force.
Unverified social media footage showed clapping and chanting protesters in Tehran's Azadi square - and reports of clashes with security forces.
Fresh demonstrations are also reported in Rasht, Sanandaj and several other Iranian cities Sunday evening.
Daniel Ghods said his girlfriend, Saba Saadat, a student of biological sciences, was a "glimpse of light" in his life before she was killed in the crash. He ordered all of the relevant agencies to compensate the families of the victims and said investigations would continue, adding, "This painful event is not an issue that we can painfully put to the side".
But there has also been praise for what one pro-government newspaper called Iran's "honest" admission of error. "We are following your protests closely, and are inspired by your courage".
What has the global reaction been?
The incident occurred shortly after Iran fired ballistic missiles at two Iraqi air bases hosting US troops, launched in response to President Trump authorizing an airstrike that killed Iranian Maj.
The most important to say is that if anyone blames the US for the accident, they most definitely are not alone.
Britain said its envoy was detained "without grounds or explanation" and in "flagrant violation of global law". Mohammad Reza Aref tweeted, "As a representative of the people in parliament I want the resignation, removal and punishment of those responsible, who dissembled, and were untruthful with people". Britain called this a "flagrant violation of worldwide law", while Iran's Foreign Ministry considered Macaire's presence at the gathering "illegal and inappropriate".
The Iranian people will probably demand accountability and the prosecution of those responsible for downing the plane, as well as the adoption of all the steps needed to ensure this does not happen again.
AFP correspondents said hundreds of students had gathered early in the evening at Amir Kabir University, in downtown Tehran, to pay respects to those killed in the air disaster.
Alam Saleh, an Iran expert, told the Wall Street Journal that the state's legitimacy has been "severely challenged by the people".
The Guards' aerospace commander General Amirali Hajizadeh accepted full responsibility. "Our anti-missile system was ready for hitting enemy's cruise missiles", Salami said.
"He had 10 seconds to decide".
"Even talking about it makes my heart beat faster and makes me sad", said Zahra Razeghi, a Tehran resident not taking part in demonstrations who spoke earlier Sunday to the AP.
He also said that he expects Iran to "fully cooperate" with Ukraine "in accordance with global law".