Egypt said on Saturday attackers who massacred Christians near a monastery had trained in militant camps in Libya which it targeted with air strikes, after Daesh claimed responsibility.
On Friday, assailants driving three 4x4 wheelers attacked by "firing randomly" at buses carrying Christians in Egypt's Minya governorate.
Mourners sang, women sobbed and men cried out in anger in a packed Egyptian church at the funeral of some of the 28 Coptic Christians killed in Friday's bus attack.
In response, Egyptian President Abdel-Fattah el-Sissi said late Friday that Egyptian jets carried out airstrikes on a bases in Libya purportedly used by militants who carried out the killings.
The Egyptian Cabinet said in a news release that 13 victims of Friday's attack remain hospitalized in Cairo and the southern city of Minya where the attack took place.
"The fact that this happened so deep within Egypt suggests to me that the bases of operations of these kinds of attacks are not over the border in Libya, but are actually within Egypt", Tarek Masoud of Harvard University told Al Jazeera. Egyptian military footage of pilots being briefed and war planes taking off was shown on state television.
Egypt's Foreign Minister Sameh Shoukry told his U.S. counterpart Rex Tillerson that the jihadists who attacked the Christian convoy had trained in Libyan militant camps.
A spokesman for the pro-Al-Qaeda Majlis Mujahedeen Derna, which controls the city in eastern Libya, said the Egyptian air force carried out eight raids on the city without causing casualties. They base their theology on the teachings of the apostle Mark, who introduced Christianity to Egypt.
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He called for countries that support terrorism to be punished while appealing to US President Donald Trump for help.
"Egypt will not hesitate in striking terror camps anywhere, either inside (the country) or outside it", said Sisi in a televised address.
And one by one, the gunmen, who had lain in wait for the convoy to appear, shot them dead, killing 29 people.
Though no one immediately claimed responsibility for the attack, it had all the hallmarks of Egypt's Islamic State affiliate.
The latest attack bore the hallmarks of the Islamic State group, which claimed responsibility for three attacks against churches since December that left about 75 people dead.
After a visit to Egypt last month by Pope Francis, IS vowed to escalate attacks against Christians and urged Muslims to steer clear of Christian gatherings and Western embassies.
Egypt's Copts form the largest Christian community in the region and 10 percent of Egypt's population of 93 million people, according to the Associated Press.