Passengers’ belongings are seen after the Ukraine International Airlines plane crashed after take-off from Iran’s Imam Khomeini airport, January 8, 2020. WANA (West Asia News Agency) via REUTERS

While five security sources – three Americans, one European and one Canadian – initial assessment is that UIA flight PS752 suffered a technical malfunction and had not been brought down by a missile, it hasn’t stopped many from speculating on what else could have caused the older model Boeing 737-800 NG to fall from the sky.

Adding to the concern is Iran’s refusal to hand over the in-flight recorder and Black Box to Boeing for further investigation.

This may change in the coming hours and days, but if Iran does not hand over the the Black Box, their reports of mechanical failure will hold little credibility as it will not be confirmed.

The Ukrainian Embassy in Tehran initially ruled out terrorism or a missile attack, but later on withdrew its online statement and replaced it with another which said the causes had not been disclosed and that any previous comments were not official.

Meanwhile, a spokesman for Iran’s Aviation Organization, said the crash was likely caused by technical failure.

However, a Ukraine International Airlines (UIA) officials said during a press conference there was nothing wrong with its plane and that it was one of its best with excellent crew and very experienced pilots. The jet had its last scheduled maintenance on Monday.

Passengers’ bodies in plastic bags are pictured at the site where the Ukraine International Airlines plane crashed after take-off from in Tehran. /Reuters Photo the Ukraine plane crash that killed all 176 on board, including 15 children and one infant according to the Iran Civil Aviation Organization.

UIA said it was suspending flights to Tehran indefinitely and vowed to find out the cause of the crash with a thorough investigation that will be conducted together with authorities from both Iran and Ukraine, as well as Boeing.

Ukrainian Foreign Minister Vadym Prystaiko and his Iranian counterpart Mohammad Javad Zarif have agreed to coordinate and create investigation groups to determine the cause, but added, “We will not give the Black Boxes to the manufacturer (Boeing) and the Americans.

“It’s not yet clear which country the Black Box will go to for the investigation,” he added.

Who are the victims?

Ukrainian foreign ministry said the victims were:

82 Iranians

63 Canadians

11 Ukrainians

10 Swedes

4 Afghans

3 Germans

3 Britons