ABIA, Nigeria, April 21 (Xinhua) -- The police in southeast Nigeria's Abia State said on Wednesday that they are combing bushes in search of the two German nationals that were kidnapped in the oil rich region.

The two, both male, were kidnapped on Sunday as they were heading to their vehicle at the beach at Imo River of the state.

State police spokesman Ali Okechukwu told Xinhua on Wednesday that the state command is working hard to help the Germans regain their freedom.

"We have not received any report about their whereabouts, but our men are still searching the bush," he said.

According to Okechukwu, though the kidnapping was reportedly said to have taken place in Abia, the police is yet to receive any formal complain from any organization about the two Germans.

"We still don't know why they fail to report the cases to the police, but as a responsible security outfit, we are working hard to secure their release," he added.

Abduction is not uncommon in Nigeria. On April 14, gunmen in the oil-rich country released four foreign nationals abducted in Rivers State.

Over 300 foreigners have been seized in the Niger Delta since 2006. Almost all have been released unharmed after paying a ransom.