the most senior member of the gaddafi clan has laid the blame of the migrant shipwreck that killed about 950 people on the western countries which helped overthrow colonel gaddafi .
ahmed gaddaf al-dam , a former minister and muammar gaddafi 's cousin , said the ` overwhelming chaos ' in libya ` has become a shame .
about 800 people are believed to have died when a fishing boat carrying migrants overturned off libyan waters , south of the italian island of lampedusa .