By Austin Ekeinde

PORT HARCOURT, Dec 1 (Reuters) - An Egyptian contractor working for an energy services firm in Nigeria's Niger Delta was killed by gunmen on Wednesday in what security sources said appeared to have been a failed robbery attempt.

The gunmen attacked a convoy carrying several expatriates on the main road from Aba, the main commercial city in Abia state, to Port Harcourt, the capital of Rivers state and the hub of Africa's biggest oil and gas industry, the sources said.

"The Egyptian was probably killed by a stray bullet during the attack. Other expats in the convoy were robbed of their personal belongings," one of the security sources said.

http://af.reuters.com/article/egyptNews/idAFLDE6B02BX20101201