Faulty sensors may have provided pilots the wrong speed data which caused a plane to crash in Russian Federation over the weekend, investigators said Tuesday.
The flight recorders captured different data in two airspeed sensors on the plane.
The Saratov Airlines An-148 was on its way to Orsk when it crashed a few minutes after taking off from Domodedovo Airport.
Emergency workers have been combing through deep snow at the crash site.
An aerial view of Russian emergency vehicles arriving near to the site of an air crash, February 11, 2018.
In the letter to Russian President Vladimir Putin, Madam Halimah wrote: "I am deeply saddened to learn of the crash of the Saratov Airlines plane on Feb 11, 2018, and the tragic loss of all passengers and crew on board".
The Saratov Airlines twinjet crashed shortly after departing Domodedovo airport on 11 February. The search would continue on Wednesday, it said. Most victims were from Orsk, where authorities declared Monday to be an official day of mourning.More news: Former NFL Player Reveals How He Lost His Hand in Horrific Accident
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The IAC also plans to reconstruct the pieces of the sensor system to see if it can identify a fault.
The An-148, developed by Ukraine's Antonov company in the early 2000s, once was touted as an example of Russian-Ukrainian cooperation, but it fell into trouble as relations between the two countries unraveled following Russia's 2014 annexation of Ukraine's Crimean Peninsula.
Before the plane slammed into the ground, one of the sensors continued to show a speed of 0 kmh while the other showed a speed of 800 kmh, according to TASS.
Onboard were six crew members and 65 passengers including three children.
Emergency vehicles at the site of the crash in the evening after it happened.
Putin thanked Trump for his offer of assistance in investigating the cause of the incident, his spokesman Dmitry Peskov said in a daily conference call with reporters Tuesday.