The Malaysian Transport Ministry said on Tuesday that the piece of suspected plane wreckage found off Thailand's coast does not belong to the missing plane MH370.
A piece of wreckage was found off the coast of southern Thailand on Saturday, prompting speculation that it might belong to Malaysia Airlines Flight MH370.
But the ministry said following an investigation that the debris does not match those of a Boeing 777, and the part numbers found on the debris were not listed on the Malaysia Airlines parts catalogue manual.
"From their detailed report, they have ascertained that the part assembly number, wire bundle number and bolts part number do not match those of a Boeing 777," transport ministry said in a statement.
The statement came a day after Japanese firm Mitsubishi Heavy Industries said the metal panel was probably from a rocket it manufactured, based on an initial examination of photos and videos of the object.
The plane had disappeared with 239 people on board during a flight from Kuala Lumpur to Beijing in March 2014.
A piece of it was found in the France’s Reunion Island in the Indian Ocean in July 2015, but no further trace has been found.
Australia is leading a multinational search for the missing jet that has so far cost more than $120 million.
The search is ongoing in the Indian Ocean and is focused on a 120 square kilometres (46,000 square miles) of seabed.
Its second phase is expected to be completed by June, Malaysian Transport Minister Liow Tiong Lai said on Sunday.