Screams can be heard after a live video feed from a Coptic church in Egypt cut out following a bomb detonation on Palm Sunday.
At least 43 people were killed in bomb attacks on two Egyptian Coptic churches that included the seat of the Coptic Pope, the latest assault on a religious minority increasingly targeted by Islamist militants.
New video, which was being broadcast live on the Coptic church's YouTube page, shows a men's choir performing inside St George's Church in the Nile Delta city of Tanta before a blast can be heard.
It cuts to black, but the screams of panic and terror can still be heard.
Islamic State (IS) claimed responsibility for the attacks, which also injured more than 100 people and occurred a week before Coptic Easter, with Pope Francis scheduled to visit Egypt later this month.
Egypt's President Abdel Fattah al-Sisi says a three-month state of emergency will be imposed after the two deadly bombings.
"A series of steps will be taken, most importantly, the announcement of a state of emergency for three months after legal and constitution steps are taken," Sisi said in a speech aired on state television.
The army chief-turned-president hasn't detailed the legal measures needed to declare the state of emergency but according to the Egyptian constitution, the parliament majority must vote in favor of it.
al-Sisi has also ordered military troops be deployed across the country.
"President Abdel Fattah al-Sisi the Supreme Commander of the Armed Forces has ordered units from the military to immediately deploy and assist the civilian police in securing vital facilities in all provinces of the republic," his office said in a statement earlier on Sunday.
Two IS militants wearing suicide vests carried out the deadly church bombings, the group said, as it warned of future attacks in a statement.
The Alexandria bombing was carried out by an IS militant the group identified as Abu Al-Baraa Al-Masri, while the Tanta church bombing was carried out by an individual it named as Abu Ishaaq Al-Masri.
The first bombing, in Tanta, a Nile Delta city about 100km north of Cairo, tore through the inside of St. George Church, killing at least 27 people and injuring at least 78, the Ministry of Health said.
Susan Mikhail, whose apartment balcony across the street has a clear view of the church, said the explosion shook her building.
"Deacons were the first to run out of the church. Many of them had blood on their white robes," she told the AP.
"Where is the government?" screamed an angry Maged Saleh, who rushed to the church in the Nile Delta city of Tanta where his mother escaped the carnage. "There is no government!"
The second bombing, carried out a few hours later by a suicide bomber in Alexandria, hit Saint Mark's Cathedral, the historic seat of the Coptic Pope, killing 17 people, including three police officers, and injuring 48, the ministry added.
It was the single deadliest day for Christians in decades and the worst since a bombing at a Cairo church in December killed 30 people.
Coptic Pope Tawadros, who had attended mass at Saint Mark's Cathedral, was still in the building at the time of the explosion but was not harmed, the Interior Ministry said.
IS' branch in Egypt appears to be stepping up attacks and threats against Christians, who comprise about 10 percent of Egypt's 90 million people and amount to the biggest Christian minority in the Middle East.
President al-Sisi condemned the attacks and summoned the National Defence Council to an urgent session.
Deflecting Western criticism that he has suppressed political opposition and human rights activists since he won election in 2014, al-Sisi has sought to present himself as an indispensable bulwark against terrorism in the Middle East, and he identifies militant Islam as an existential threat.
"The attack...will only harden the determination [of the Egyptian people] to move forward on their trajectory to realise security, stability and comprehensive development," al-Sisi said in a statement.
Thousands gathered outside the Tanta church shortly after the blast, some weeping and wearing black.
They described a scene of carnage. "There was blood all over the floor and body parts scattered," said a Christian woman who was inside the church at the time of the attack.
Though Copts have in the past faced attacks by Muslim neighbours, who have burnt their homes and churches in poor rural areas, the Christian community has felt increasingly insecure since Islamic State spread through Iraq and Syria in 2014 and ruthlessly going after religious minorities.
Pope Francis marked Palm Sunday in St. Peter's Square by expressing "deep condolences to my brother, Pope Tawadros II, the Coptic church and all of the dear Egyptian nation."
US President Donald Trump tweeted that he is "so sad to hear of the terrorist attack" against the US ally but added that he has "great confidence" that al-Sisi "will handle the situation properly."
The two leaders met at the White House on April 3.