Families of loved ones aboard missing Malaysian plane MH370 have asked for a 60-day extension of the search set to end in early March, according to a statement posted to Twitter Tuesday by an advocacy group purporting to be for friends and family of the missing. The plane disappeared from radar nearly two years ago, and the only confirmed piece of debris was a flaperon that surfaced on the French Reunion Island in the Indian Ocean in July 2015.

"We urge Malaysia and other relevant authorities to extend the time period for such claims/lawsuits beyond March 8th by at least 60 days," the release from advocacy group Voice370 read, adding: "Voice370 will not stand by this injustice silently. The search must go on, and when the facts are known, the companies and individuals responsible for the loss of MH370 must be brought to justice."

Flight MH370 was traveling from Kuala Lumpur to Beijing in March 2014 when it disappeared from radar without a trace. Despite finding a flaperon on Reunion Island, authorities have still been unable to determine what exactly happened to the plane that disappeared carrying 239 people. 

Many theories with varying degrees of credibility have surfaced since the plane's disappearance, including the possibility that the pilot may have deliberately crashed it, as a Germanwings pilot did in March 2015, killing all 150 people onboard. Investigators close to the search have said they mostly ruled out that theory, however.

"The limited evidence available for MH370 was compared with three accident classes: an in-flight upset, an unresponsive crew/hypoxia event and a glide event [generally characterized by a pilot-controlled glide],” according to Dan O’Malley, an Australian Transport Safety Bureau representative cited by the Australian in January. O’Malley said his organization favored the hypoxia event, in which cabin oxygen pressure dropped, causing the pilots to lose consciousness and crash the plane.