BEIJING, March 10 — China’s Foreign Ministry today urged Malaysia to step up search and investigation efforts over a missing Malaysia Airlines jetliner with 239 people on board.

Ministry spokesman Qin Gang made the comments at a daily news briefing.

Questions have mounted over possible security lapses and whether a bomb or hijacking could have brought down the Beijing-bound plane, after Interpol confirmed at least two passengers used stolen passports and said it was checking whether others aboard used false identity documents. — Reuters