Observers say Our Ocean is the only conference to address all ocean-related issues under one roof.
The bus was transporting migrants who had crossed the Darien Gap, an inhospitable jungle area bordering Colombia, and was moving westward with the aim of eventually reaching the US.
Luis Enrique and Ricardo Martinelli were released slightly ahead of completing their three-year terms because of good behaviour, a spokesperson for the federal Bureau of Prisons said.
Officially, 500 people died, but rights groups claim the true number was in thousands when 27,000 US soldiers invaded Panama with the backing of fighter planes, tanks and heavy artillery.
Pressure groups continue a weeks-long movement against rising inflation and corruption in the Central American country, saying a deal with the government to end protests was "signed under pressure."
About 1,000 migrants decide to pause their march, hoping to get some sort of temporary exit visa while 2,000 others continue their walk in US direction.
Human rights organisations have long estimated the true number of Panamanian victims could be higher than the official toll of 300, prompting the establishment of a commission to investigate the true number.
Iranian-flagged MT Horse and Panamanian-flagged MT Frea were seized in waters off Indonesia's West Kalimantan province, officials say.
Nearly 200 migrants and refugees among a much larger group of Africans, Cubans and Haitians stranded by coronavirus pandemic in remote Darien region.
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