LAGOS, Jan 14 (Reuters) - The main militant group in Nigeria's oil-producing Niger Delta warned on Wednesday it would end its ceasefire and attack military targets in retaliation for the killing by soldiers of a gang leader in the region.

"MEND has decreed today every soldier in uniform inside the Niger Delta region as a fair target," the Movement for the Emancipation of the Niger Delta (MEND) said in an e-mailed statement.

"Our first spectacular urban attack on a military patrol will announce the end of the ceasefire." (Reporting by Nick Tattersall)

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