In September, the United States began launching dozens of deadly military strikes against alleged drug-smuggling boats in the Caribbean Sea and eastern Pacific.

Nearly half a year later, remarkably little is known about the strikes. The identities of the nearly 157 people killed have not been released. Any purported evidence against them has not been made public.

But a group of United Nations and international law experts are hoping to change that on Friday, when they testify at the Inter-American Commission on Human Rights (IACHR).

The international hearing will be the first of its kind since the strikes began on September 2, and rights advocates hope it can help lead to accountability as individual legal cases related to the strikes proceed.

Steven Watt, a senior staff lawyer with the American Civil Liberties Union’s human rights programme, said the goal of the hearing will be threefold.

“Our ask will be to conduct a fact-finding investigation into what’s going on,” Watt said.

The second aim, he continued, would be “to assert or to arrive at a conclusion that there is no armed conflict here”, in what would be a rebuke to US President Donald Trump’s previous claims.

Finally, Watt said, he hopes the proceedings will yield long-sought transparency from the Trump administration on “whether or not they have a legal justification for these boat strikes”.

“We don’t think there are any,” Watt added.

‘We don’t know the names’

The experts set to testify at Friday’s hearing said the IACHR has a unique mandate to uncover the truth behind the US strikes.

The commission, based in Guatemala City, Guatemala, is an independent investigative body within the Organization of American States, of which the US was a founding member in 1948.

While the Trump administration has claimed it has a right to carry out the deadly attacks as part of a wider military offensive against so-called “narco-terrorists”, rights groups have decried the campaign as a series of extrajudicial killings.

They argue that Trump’s deadly tactics deny those targeted of anything that approaches due process.

Legal experts have also dismissed Trump’s claims that suspects in drug-related crimes are equivalent to “unlawful combatants” in an “armed conflict”.

Few details have emerged from the air strikes. Several families have come forward, however, to informally identify the dead as their loved ones.

Victims are said to include 26-year-old Chad Joseph and 41-year-old Rishi Samaroo, who were sailing home to Trinidad and Tobago when they were killed in October, according to relatives.

A complaint filed against the US government said both men travelled often between the islands and Venezuela, where Joseph found work as a farmer and fisherman, and Samaroo laboured on a farm.

The family of Colombian national Alejandro Carranza, 42, have also said he was killed in September when the US military attacked his fishing boat off the country’s coast.

The US has yet to confirm the victims’ identities, and only two survivors have ever been rescued in the 45 reported strikes.

A clearer picture of what happened will be a significant step towards accountability, according to experts like Watt.

“[The IACHR] is uniquely positioned to identify who all these persons are,” Watt said. “We just know the numbers from the United States. We don’t know the names or the backgrounds of these people.”

The IACHR has launched a range of human rights investigations in recent decades, including probes into the 2014 mass kidnapping of 43 students in Iguala, Mexico, and a series of murders in Colombia from 1988 to 1991 dubbed the Massacre of Trujillo.

The commission has also examined US policies, including extrajudicial detentions at Guantanamo Bay, Cuba, during its so-called “global war on terror”.

The IACHR has the power to seek resolutions to human rights complaints or refer them for litigation before the Inter-American Court of Human Rights.

Just last week, the court ordered Peru to pay reparations to the family of a woman who died during a government-led forced sterilisation campaign in the 1990s.

The Carranza family has filed its own complaint to the IACHR, and the families of Joseph and Samaroo have also lodged a lawsuit against the US in a federal court in Massachusetts.

Angelo Guisado, a senior staff lawyer at the Center for Constitutional Rights (CCR), said a fuller accounting of the US actions is needed to prevent future abuses. He is among the experts testifying on Friday.

“You can’t normalise assassinating fishermen off the coast of South America,” Guisado told Al Jazeera. “That’s just sadistic and an abomination to the rules-based order that we’ve created.”

“So we hope that the commission can do some investigation.” (Al Jazeera)