Officials say nearly 60,000 Congolese citizens now have been deported from its much smaller neighbour Republic of Congo in the last three weeks.
Many of those being ordered to leave have complained of mistreatment on the part of the forces carrying out the deportations.
Congo's interior minister, Richard Muyej Mangez, said today at a news conference in Kinshasa that authorities there now were opening investigations into the allegations made by the deportees.
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Authorities in Republic of Congo maintain that the deportees lack the proper immigration papers to stay in Brazzaville.
And the mayor of its capital has said that any police officers caught abusing citizens would face justice.