In the 1980s, he developed chemical weapons, because of it critics called Libya a pariah state. A Dutch investigation found that Gaddafi had built up a "billion-dollar empire", from assets in an international company in the oil industry. It also claims that his assets are scattered throughout much of Europe, Despite no trace or proof for even 1 billion have been found. Gaddafi had a strong interest in geo-political control, was a firm supporter of OAPEC and led a Pan-African campaign for a United States of Africa. In 1986 Libya was bombed by US, home of Gaddafi was targeted but he survived. Bombing was condemned by many nations and also by UN.