A UN report has warned that systematic abuses by Somalia's government have allowed weapons to be diverted to warlords and al Shabab militants. The report for the UN's sanctions committee calls for the restoration of an arms embargo on Somalia that was relaxed last year. It said a key advisor to Somalia's president has been involved in planning weapons deliveries to militants. Somalia's mission to the UN has questioned the report's validity. The confidential 14-page report was compiled by the UN's Somalia and Eritrea Monitoring Group