Officials say the three tourists killed in Mexico were believed to have been attacked while trying to prevent their vehicle being stolen.
The bodies of Australian brothers Callum, 33, and Jake Robinson, 30, as well as American Carter Rhoad, 30, were found at the bottom of a well in Baja California state after a days-long search.
According to Baja California state prosecutor Maria Andrade, it's believed that the attackers were trying to steal the tyres from the vehicle and shot the trio when they resisted.
Their bodies were found in a 15ft deep well on Friday, each victim had been shot in the head. Authorities found a burnt pick-up truck, abandoned tents, and a phone nearby.
Three people have been detained by police in suspicion with the attack.
A fourth body was also found in the well, unconnected to the case, officials confirmed.
South Africa's constitutional court ruled on Monday that former president Jacob Zuma was not eligible to run for parliament in this month's election, a decision that was closely watched as it has the potential to affect the outcome of the election.
King Salman will undergo a treatment programme at Al Salam Palace in Jeddah for a lung inflammation, the state news agency said on Sunday, hours after he underwent medical tests.
Israeli troops and tanks pushed on Saturday into parts of a congested northern Gaza Strip district that they had previously skirted in the more than seven-month-old war, killing and wounding dozens of Palestinians, medics and residents said.
Slovak Prime Minister Robert Fico is no longer in immediate danger but still in a serious condition, his deputy said on Sunday, four days after an assassination attempt that sent shockwaves through Europe.