Police in the Brazilian city of Rio de Janeiro have moved into the Alemao shantytown in the latest of series of operations aimed at pushing members of a drug gang out of the slums. About 600 drug gang members are believed to be holed up in Alemao, a grouping of a dozen slums in the north of the city where tens of thousands of people live, after fleeing earlier operations by the security forces in neighbouring areas. Intermittent gunfire could be heard as soldiers in camouflage, black-clad police from elite units and regular police slowly entered the slum at 7.20am local time on Sunday. "This is our D-Day," Colonel Lima Castro, the military police spokesman, said in a reference of to the historic allied invasion of Normandy during World War Two. "We will return this community to the people of Rio de Janeiro."