June 16, 2014 11:17 AM EDT

Malaysian authorities promised Sunday not to give up the search for missing Malaysia Airlines Flight 370, as the massive international hunt passed the 100-day mark.

Families of some of the passengers who were aboard gathered in Beijing to pray, BBC reports. The flight disappeared March 8 with 239 people aboard en route from Kuala Lumpur to Beijing. Authorities believe it went down in the Indian Ocean with no survivors, and it has since led to the largest, longest, and most expensive search in modern commercial aviation history.

“This search effort is unprecedented in sheer scale and complexity,” Malaysian Transport Minister Hishammuddin Hussein said in a statement Sunday, the Associated Press reports. “We reaffirm our commitment with renewed vigor to locate the missing MH370.

Malaysian Prime Minister Najib Razak also expressed his sympathy and support for the families on Sunday. “On this hundredth day since went missing, remembering those on-board & their families,” he wrote on Twitter. “M’sia remains committed to the search effort.”

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