The statement named 19 other suspected militants believed to belong to the same cells and offered a 100 thousand Egyptian pound (5,515.72 dollars) reward for any information on them.
After the bombings, Sisi ordered military deployments to guard "vital and important infrastructure", his office said.
On Tuesday parliament approved President Abdel Fattah el-Sissi's decision to declare a three-month state of emergency following the Isis suicide bombings in Alexandria and Tanta which killed 45. We also pray for our Coptic Orthodox sisters and brothers who continue to be resilient in the face of ongoing and escalating attacks, and who resist the urge to react vengefully or reciprocally.
For his part, Pope Tawadros II stated that terrorism will not succeed to divide the Egyptians or undermine their unity and stability.
State television reported that the interior minister sacked the provincial head of security and replaced him after the attack.
Islamic State has waged a low-level war against soldiers and police in Egypt's Sinai Peninsula for years but it is increasingly targeting Christians and broadening its reach into Egypt's mainland.
United passenger set for legal action
The incident attracted a storm of negative publicity for United, as did their initial handling of it in the immediate aftermath. Dao was treated in a Chicago hospital for his injuries, according to a statement from lawyers who said they represent him.
Sisi had ordered troops to protect the nation's "vital infrastructure" in the aftermath of the attacks on the Christian Palm Sunday holiday, one of the holiest days of the Christian calendar marking the triumphant entrance of Jesus to Jerusalem.
The Vatican says some 165,000 Catholic Copts lived in Egypt in 2010. The attack on St. George's in Tanta, almost 60 miles north of Cairo, killed 28.
Copts make up about 10 percent of the 92-million population of mostly Muslim Egypt and are the region's largest Christian denomination, with a almost 2,000-year-old history in the country.
President Donald Trump expressed his condolences on Twitter, writing "So sad to hear of the terrorist attack in Egypt", and that he was confident Sisi would handle the situation properly.
Sunday's blasts are the latest attacks against Christians. In certain local villages, the faithful celebrate Mass before a cross drawn on a wall, making it easy to erase quickly in order to avoid attacks. "United States strongly condemns. I have great confidence that President Al Sisi will handle situation properly", Trump wrote on his official Twitter account. The Coptic Pope later went on to make a statement claiming that the acts would not destroy the cohesion and unity among the people.
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