The MP added that no arrests have been made in relation to the incident, contrary to official claims.
"They have told the relatives to keep silent, or expect consequences experienced by Pouya Bakhtiari's father," wrote Meimandi on Instagram.
31-year-old Ido Segev was among those killed. His family has been notified.
Najib told online news portal Free Malaysia Today that Malaysian officials had considered such a scenario during their investigation but had chosen not to make their views public.
Mohammad Javad Zarif said that the US and Iran were "very close to a war" and that, at the moment, the black box of the crashed Ukrainian airliner is not being touched.
Iran admitted its missiles downed the Ukrainian airliner by mistake on Jan. 8, killing all 176 people aboard, including 57 Canadians.
How Iranian regime apologists in the West used social media to silence whistle-blowers about the Ukrainian jetliner destroyed by the IRGC
The wounded were being treated at 18 nearby hospitals.
The plane broke apart as it touched down at Istanbul's Sabiha Gokcen airport on Wednesday evening.
All 176 people aboard the flight were killed when the plane crashed shortly after takeoff en route from Tehran to Kiev on Jan. 8.