A Scottish oil worker has been kidnapped by gunmen at a rig in Nigeria.

The attackers raided the Niger Delta Petroleum Resources-owned site in Ogbele, Rivers State, at 8am on Saturday.

A man from Scotland, along with two others from Canada and Nigeria, were abducted - the second incident of its kind in a week.

Troops were searching surrounding swamps but couldn't find the kidnappers.

Speaking to STV News, a Nigerian Army spokesman said: "We can confirm one of the workers is from Scotland.

"There were three in total.

"They are all still missing at this point.

"A major search and rescue operation is under way."

It comes after two Royal Dutch Shell oil workers were kidnapped and their police escorts were killed on Thursday in Rivers State while returning from a trip.

Major Ibrahim Abubakar added: "At about 8am on April 27, some gunmen visited the rig belonging to Niger Delta Petroleum Resources and carried out the attack and kidnapped two expatriates.

"When we heard about the incident, we mobilised to comb the swamp but to no avail; we couldn't arrest the perpetrators.

"Efforts have been intensified to rescue and arrest culprits, but we have also advised the management to provide adequate security to their operations."

Major Abubakar added that no ransom has been demanded yet for the workers.