An Egyptian court listed the Palestinian group Hamas as a terrorist organisation, Egyptian state television said.
Hamas is an offshoot of Egypt's Muslim Brotherhood which the authorities have also declared a terrorist group and have repressed systematically since the army ousted one of its leaders, Mohamed Mursi, from the presidency in 2013.
An Egyptian court decision to list Hamas as a terrorist organization is "shocking and dangerous," the Islamist group said in a statement.
"The Egyptian court's decision to list the Hamas movement as a terror organization is shocking and is dangerous, and it targets the Palestinian people and its factions of resistance," the statement said.
"It will have no influence on the Hamas movement, which enjoys the respect of all the nation and the leaders of the nation."
Five bombs exploded in Cairo today killing one person and wounding five others.
Three police officers were injured when one of the bombs went of near a police station in the district of Alwaraq, the Egyptian Interior Ministry said in a statement.
One person was killed and a further two wounded when one of the devices went off outside a restaurant in a residential district of the Egyptian capital.
The other three bombs resulted in damage to businesses, including a Vodafone shop, but there were no reports of injuries in the middle-class district of Mohandeseen, where most of the attacks took place.
Egypt has experienced an influx in violence since General Abdel Fattah al-Sisi (now President Sisi) overthrew Mohamed Morsi in 2013. Most of the ensuing violence has taken place in the restless Sinai Peninsula.
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The State of Qatar has reportedly recalled its ambassador based in Cairo amid disputes over Egypt's decision to carry out air strikes in Libya.
According to state news agency QNA, the director of Arab affairs at the Qatari foreign ministry voiced concern at an Arab League meeting in Cairo over the decision to carry out air raids in Libya without consultation with other Arab states.
Egypt has carried out a number of air strikes after militants claiming to be alligned to Islamic State extremists beheaded 21 Egyptian Christians.
David Cameron stressed Britain "has not abandoned Libya" after Egypt bombed Islamic State targets in the country in response to the murder of 21 Egyptian Christians.
"What we face in Libya is a very difficult situation, with far too many armed militias, without a proper government and with the growth of ungoverned space," the Prime Minister said.
"What the whole world needs to do is come together and work for Libya that has a national unity government."
Egyptian President Abdel Fattah Al-Sisi called for a United Nations resolution mandating an international coalition to intervene in Libya after its jets bombed Islamic State targets there.
"There is no other choice, taking into account the agreement of the Libyan people and government and that they call on us to act," he told France's Europe 1 radio.
Asked if Egypt would resume its own action, he said: "We need to do it again, and all of us together."
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Egypt has opened a new front in the war against so-called Islamic State, bombing targets on the doorstep of Europe. It launched two waves of airstrikes on the Islamist terrorists in Libya.
It follows the mass murder of 21 Egyptian Christians on the Libyan seafront, barely 200 miles from the frontier of Europe. The Egyptian government has called on the international community to intervene in Libya.
ITV News Africa correspondent John Ray reports:
The bombing of Libya was a unilateral Egyptian air-force strike. Relations between the el-Sissi regime and Washington are poor, and yes Washington would have watched this strike unfold in real time.
I think there is a bigger strategic point here as well. How does the West tackle these sorts of crises in North Africa and the Middle East. We have tried intervening in Libya and it has led to almost total chaos. We've tried not intervening in Syria and we are left with a humanitarian catastrophe.
So it really means that there is no template, no model for success, and we are left with what we are seeing now. A deteriorating situation right across the region.
David Cameron has spoken to Egyptian president Abdel Fattah el-Sisi to offer his condolences over the murder of the Egyptian Christians and to discuss how Britain and Egypt could work together to fight terrorism.
Mr el-Sisi and the Prime Minister agreed that a political solution was the best way to solve the Libyan crisis.
"The Prime Minister recognised that Egypt, as one of Libya's neighbours, had a particular interest in protecting itself from violent extremism on its borders and that both countries shared the same objective: a safe and secure Libya," a Downing Street spokeswoman said.