An investigation into the disappearance of a Malaysia Airlines jetliner is focusing more on a suspicion of foul play, as evidence suggests it was diverted hundreds of kilometers off course, sources familiar with the Malaysian probe said.

In a far more detailed description of military radar plotting than has been publicly revealed, two sources told Reuters an unidentified aircraft that investigators suspect was missing Flight MH370 appeared to be following a commonly used navigational route when it was last spotted early Saturday, northwest of Malaysia.

The latest radar evidence is consistent with the expansion of the search for the aircraft to the west of Malaysia.

However, Malaysia's air force chief said Wednesday that an aircraft that could have been the missing plane was plotted on military radar at 2:15 a.m., 320 kilometers northwest of Penang Island off Malaysia's west coast.

This position marks the limit of Malaysia's military radar in that part of the country, a fourth source familiar with the investigation told Reuters.

Malaysia says it has asked neighboring countries for their radar data, but has not confirmed receiving the information.

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