NABLUS, West Bank, May 30 (Reuters) - Two Palestinians were killed and two others wounded when a car exploded in the West Bank city of Nablus on Wednesday, witnesses and hospital officials said.

They said the casualties were men in their 20s. Their identities were not immediately known.

Nablus has seen frequent fighting between Palestinian militants and Israeli troops over the past 6 1/2 years of conflict. A military spokesman said he knew of no Israeli actions in Nablus at the time of the blast.

A local security source, who asked not to be identified, said Palestinian authorities were investigating whether the blast was caused by a bomb that went off prematurely.

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