DR Congo military crackdown: Two colonels arrested after civilian killings

Two army colonels have been arrested in the Democratic Republic of Congo, following the killing of more than 46 people.
The demonstrators were shot during a military crackdown in the eastern city of Goma.
The group were protesting against a UN peacekeeping mission there which they say has failed to tackle armed groups.
A government delegation is in the city to investigate the killings.