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The United Nations' refugee and migration agencies on Friday criticised Greece's failure over the past year to shed light on one of the worst migrant shipwrecks in the Mediterranean SeaÌýthat left hundreds dead.

UNHCR and IOM stressed the "critical" importance of a "comprehensive and conclusive" investigation in a joint statement on the first anniversary of the 14 June, 2023, tragedy off southern Greece.

"Investigations have been initiated in Greece but so far no outcome establishing the facts on the incident has been communicated," they said.

Left-wing groups planned protest marches later Friday in Athens and other cities, as well as outside Greek embassies and consulates in other European countries.

Migrant charities and rights groups have widely criticized the Greek coast guard's handling of the shipwreck in international waters 75 kilometers (45 miles) off the town of Pylos.

Only 104 people survivedÌýthe sinkingÌýof the Adriana, a rusty metal fishing boat smuggling up to 750 migrants from Libya to Italy. Although the vessel was clearly in bad shape, Greek officials were unable to evacuate the passengers before it sank.ÌýSurvivors have saidÌýthe Adriana went down during a botched coast guard attempt to tow it, which Greek officials strongly deny.

"A thorough investigation is essential to secure justice for the survivors and the families of the victims and to help prevent similar tragedies in the future," the two UN agencies said.

On Thursday, rights groups Human Rights Watch and Amnesty International said "a credible process for accountability" was needed.

"It is unconscionable that one year since this horrific tragedy, the investigation into the potential liability of (Greece's) Coast Guard has barely progressed," HRW official Judith Sunderland said in a joint statement by the groups.

A naval court launched a preliminary investigation days after the accident but has released no information on its progress. In November 2023, Greece's state ombudsman startedÌýa separate probe.

Greek officials had made no statement as of early afternoon Friday to mark the shipwreck anniversary, and did not respond to previous requests for comment.

Greece is a main entry point for people from the Middle East, Africa and Asia seeking a better life in the European Union.