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Schools preparing to receive their GCSE results today have been told to expect "variable" grades.
There are particular concerns among some headteachers about English and maths grades, according to initial reports.
The potentially unpredictable results are said to be due to significant alterations to the qualifications this year.
Brian Lightman, general secretary of the Association of School and College Leaders, which represents a large proportion of secondary heads, said: "We are getting some individual reports of volatility, but we don't know about overall trends yet.
"Some schools have seen surprises. Some schools have seen results which are lower than expected."
Three senior Hamas military commanders have been killed in Israeli air strike in the Gaza Strip, the Islamist militant group said.
Hamas named the men as Mohammed Abu Shammala, Raed al-Attar and Mohammed Barhoum and said they were killed in a bombing of a house in the southern town of Rafah.
The Israeli military had no immediate comment on what would be the killing of the most senior Hamas men since Israel launched its offensive in the Palestinian enclave on July 8.
At least six people have been killed when an Israeli airstrike hit a densely populated neighbourhood in Gaza, Palestinian police said.
According to the Associated Press, the strike destroyed a four-storey structure in the southern town of Rafah and that rescue workers were still searching for people trapped in the rubble.
The strike was one of 20 the Israeli military says were carried out following the breakdown of Egyptian-mediated talks aimed at producing a long-term truce after more than a month of fighting that has killed more than 2,000 Palestinians, mostly civilians. Israel lost 67 people, all but three of them soldiers.
Israeli military said that they struck 20 targets in Gaza overnight in response to rocket fire from Hamas, as a six-day truce collapsed into heavy fighting.
In response to Hamas rocket fire, we struck 20 targets in Gaza last night.
US Attorney General Eric Holder sought to reassure the people of Ferguson about the inquiry into the shooting death of a black 18-year-old by a white police officer.
The attorney general remembered how he was stopped twice on a New Jersey highway and accused of speeding. Police searched his car, going through the boot and looking under the seats.
"I remember how humiliating that was and how angry I was and the impact it had on me," Mr Holder said during a private meeting with about 50 community leaders at St Louis Community College.
As demonstrations continue in Ferguson, Missouri over the police shooting of unarmed teenager Michael Brown, a protester is seen to have been carrying a sign saying "Go kill Isis!!! And leave us alone".
The Israeli military reported that since the collapse of a ceasefire with the Palestinians, over 213 rockets had been fired at Israel.
Since Hamas breached the ceasefire over 213 rockets were fired at Israel; 162 hit, 35 were intercepted and 16 landed short in the Gaza Strip
Thai junta leader General Prayuth Chan-ocha was elected prime minister in parliament in a move that has been widely expected since he seized power in May.
Prayuth has won at least half the votes, the required number needed to secure his nomination, a live television broadcast of the parliamentary session showed. The 60-year-old was the only person nominated.
His appointment will need to be formally approved by Thailand's king. The military says it took power on May 22 to avoid further bloodshed and restore stability after months of unrest pitting supporters of ousted Prime Minister Yingluck Shinawatra against her Bangkok-based royalist opponents.
The Governor of Missouri has met with local school leaders in Ferguson, after schools were forced to close amid violent unrest over the police shooting of teenager Michael Brown.
Thankful 4 calmer night in #Ferguson. Good to 2c peaceful protesters & community ldrs standing w law enforcement against violent instigators