Pirates have seized a Maltese-flagged oil tanker off the coast of Nigeria's oil-rich southern delta and kidnapped the foreign crew, reports say.

The attack happened off the coast of Port Harcourt, according to security sources.

An unknown number of foreign crew members remained held today as the pirates offloaded the tanker's oil cargo.

The tanker was identified as the MT Halifax.

Analysts say the area has seen a growing trend of oil tanker hijackings as pirates target legal and illegal oil shipments moving out of Nigeria.

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