Islamic State destroyed another irreplaceable ancient artifact
Islamic State militants have reportedly destroyed another irreplaceable ancient artifact in the ancient Syrian city of Palmyra.
Activists say Islamic State blew up the city's Arch of Triumph, describing it has having been "pulverized."
The Syrian Observatory for Human Rights says the arch had ornaments that Islamic State militants considered blasphemous.
If the destruction is confirmed by satellite images, it would be the third ancient site destroyed since the Islamic State group seized Palmyra in May.
Two Roman-era temples already have been blown up.
The extremists consider ancient historic artifacts and images to be blasphemous. The United Nations and historians regard such actions to be war crimes.
US to set up two new marine sanctuaries
U.S. President Barack Obama will address the summit Monday in a video message to announce the creation of two new U.S. marine sanctuaries in the states of Maryland and Wisconsin.
Other countries are also expected to announce similar moves.
U.S. Secretary of State John Kerry is attending the conference.
Several countries and foundations are set to pledge funds and propose initiatives to fight pollution, overfishing and the acidification of the ocean by carbon emissions.
The U.S. is also expected to announce a plan, called Sea Scout, designed to bring a halt to the world's illegal and unregulated fishing trade.
Chilean President Michelle Bachelet and Foreign Minister Heraldo Munoz will also speak at the conference.