The Algerian coastguard reportedly shot at four French-Moroccan tourists who strayed into Algerian waters.
Dozens of refugees left without water or food in the desert after being expelled from Tunisia following racial tensions.
Coastline to remain off limits with a ban on swimming, snorkelling and other water sports activities until Sunday.
Concerns range from water supplies and oil pipelines to a new humanitarian crisis in the making.
Khartoum residents struggle with power cuts, water shortage as fighting rages for fifth day.
Police use water cannon and tear gas after crowds cause havoc in centre of Brussels after Moroccos shock World Cup win.
A climate-change resistant Red Sea reef is being flooded with toxic wastewater, leaked documents show.
Bodies of beheaded girls were found in sewage waters at al-Hol detention camp in northeastern Syria, officials say.
Alaa Abdel Fattah tells his family in a letter from prison that he has resumed drinking water.
US says it wants the jailed British-Egyptian activist, who is on a hunger and water strike, freed.