Naval and coast guard reinforcements from Brazil and Trinidad and Tobago are due to arrive in Guyana on Wednesday, bolstering an intensifying search for those still missing from the MV Barima disaster.

Prime Minister Brigadier (Ret'd) Mark Phillips announced the reinforcement on Tuesday at his office, saying the regional teams would strengthen Guyana's ongoing operation, which has intensified since the wreckage of the vessel was located.

"Additional support from the governments of Trinidad and Tobago and Brazil is en route to Guyana. Personnel from the Trinidad and Tobago Coast Guard and the Brazilian Navy are expected to arrive tomorrow to reinforce the ongoing search and rescue operations," Phillips said.

The additional personnel will join an extensive multi-agency response involving 16 state and private sector vessels, French and local divers, and aerial surveillance assets, with the search area now extended to Waini Point.

Phillips said the Maritime Rescue Coordination Centre remained fully operational and gave assurances that the operation would continue until every reasonable effort had been exhausted.

As of 6pm Tuesday, authorities had verified that 76 people were rescued and 53 bodies recovered, with 26 positively identified.

The Government has also been facilitating the transport of relatives for victim identification and the repatriation of bodies to their home communities.

President Dr Irfaan Ali has declared three days of national mourning as Guyanese continue to grieve the tragedy. (DPI)

Prime Minister Brigadier (Ret'd) Mark Phillips