Egypt has announced early presidential elections likely to anoint the general who overthrew Islamist president Mohamed Morsi, as jihadists claimed they downed a military helicopter over a bloody weekend that killed dozens nationwide.
Interim president Adly Mansour announced the poll in a televised address on Sunday, a day after 49 people died in clashes between Islamist protesters and police, and thousands rallied in support of military chief General Abdel Fattah al-Sisi.
Sisi was expected to declare his candidacy for the election, scheduled before mid-April, after a show of support including Saturday's large rally in Cairo's Tahrir Square.
The weekend clashes and bombings also highlighted the interim government's precarious grip seven months after Morsi's overthrow.
On Sunday, an Al-Qaeda-inspired group released a video it said showed its fighters downing a military helicopter with a missile in the lawless Sinai peninsula.
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The group, Ansar Beit al-Maqdis, also claimed credit for a car bombing outside police headquarters in Cairo on Friday morning that killed four people.
The military has acknowledged five soldiers were killed in an incident involving a helicopter on Saturday, but said it was "an accident".
Over Friday and Saturday, five bombs went off after the attack on the Cairo police headquarters, killing more people.
The violence came as Egypt commemorated the 2011 uprising that overthrew veteran strongman Hosni Mubarak, leading to three years of tumult that many hope Sisi's election will end.
On Saturday, the third anniversary of the uprising, 49 people were killed in clashes when police clamped down on protests by Morsi's Islamist supporters and anti-military activists, the health ministry said.
The protests were organised by Morsi's Muslim Brotherhood movement and its Islamist allies.
As Mansour addressed the nation to announce the early presidential election, relatives of those killed on Saturday assembled outside a Cairo morgue, chanting anti-military slogans.
"Down with the military! The people want to topple the regime!" they chanted outside the Zeinhom morgue as they collected the corpses of loved ones.
In his address, Mansour, a judge the military appointed as interim president to replace Morsi, pledged to "uproot (terrorists) and show them no mercy".
The government says a series of polls that started with a constitutional referendum in January and will end in parliamentary elections will restore an elected government by 2015.
