Russian authorities have struggled to contain Islamic extremism that has gripped the North Caucasus region over the last couple of years.
The operation to retake the city of Fallujah, Iraq, from the Islamic State group is not going as well as Baghdad had planned.
Memphis police told the Associated Press that a person is being held in connection with the shooting death of Officer Sean Bolton.
The Turkish military on Sunday also denied accusations of having killed civilians in Friday's bombardment on Zargala in Iraq's Kurdistan region, which had drawn protest the region's President Massoud Barzani.
Kerry also said he was "absolutely convinced" all countries in the Middle East would be safer as a result of a nuclear deal between world powers and Iran agreed last month.
Turkey insists its bombing campaign in northern Iraq is focused on militants of the Kurdistan Workers' Party (PKK).
The attack was carried out with a tractor loaded with two tonnes of explosives on a gendarmarie outpost located in the Dogubeyazit district of eastern Agri province, bordering Iran, the governor's office said.
The officer was shot multiple times by the occupant of a vehicle he had stopped. He is the third police officer slain in the line of duty in Memphis in the last four years.
British and French government ministers are calling for EU action to curb what they dub a "global migration crisis" that has hit their shores in recent weeks.
"That was one of the most incredible temperature observations I have ever seen," AccuWeather meteorologist Anthony Saglia says.
At least 260 members of the Kurdistan Workers' Party have been killed during Turkey’s air campaign since July 24.
The Turkish government is rounding up and jailing Kurdish activists in Istanbul.
While British politicians are talking tough on the migrant crisis facing the country, refugees in France are determined to get to the U.K. at any cost.
Chad said on Thursday its forces had killed 117 Boko Haram insurgents during a two-week military campaign aimed at clearing islands on Lake Chad used by the militants as hideouts and bases to launch attacks.
Ramzan Kadyrov has denied claims by the Islamic State group that it had opened branches in the predominately Muslim North Caucuses region.
"The burning of remains did not violate any orders, rules of engagement or international laws or conventions," a Marine Corps spokesman said.
The arrests come just over a month after an ISIS-linked bomber killed 27 people at a Shiite mosque in Kuwait City.
Yousef Al-Qaradawi said that he had previously endorsed the use of suicide bombers only by those living under Israeli occupation.
Female recruits will need to be "recruited, accessed, trained, tested and assigned" before taking any of the 245,000 jobs currently unavailable.
Syria and Iraq together account for about 20,000 foreigners fighting alongside militant groups like al Qaeda and ISIS, the U.N. estimated in April.
Harlem Suarez, 23, was allegedly plotting to detonate a backpack bomb at a public beach in Florida.
An internal report showed one in three veterans dying before the centers got around to processing their applications.