The Democratic People's Republic of Korea (DPRK) has informed South Korea that it will send inspectors to Seoul this weekend to verify evidence related to the sinking of South Korean warship Cheonan, Seoul's Yonhap News Agency on Friday quoted military sources as saying.

But the sources from the Defense Ministry said it is difficult to accept the DPRK's inspection, Yonhap said.

South Korea on Thursday announced the outcome of investigations over the Cheonan incident made by a multinational team, which said the warship that went into waters near a tense maritime border with the DPRK in March was torpedoed by the DPRK.

The DPRK on Thursday immediately rejected Seoul's claims that it sank the warship by a submarine, and said it will dispatch inspectors to South Korea to verify Seoul's claim.

In a statement, the DPRK called the conclusion by an international investigation team of civilian and military experts a "fabrication," and also warned of stern measures including an "all-out war" if further sanctions were imposed on the DPRK.