A soldier searches for debris from EgyptAir Flight 804 over the Mediterranean Sea. (Alexandre Groyer/Marine Nationale via AFP/Getty Images)

Egyptian forensic experts have examined human remains retrieved from the site of the EgyptAir Flight 804 crash, officials told news agencies on Tuesday, amid conflicting statements on whether the initial findings suggest an explosion brought down the plane.

Senior forensic officials, speaking to Reuters and the Associated Press on the condition of anonymity, were quoted as saying that the small size of the body parts suggested that some type of explosion tore the plane apart last week over the Mediterranean. All 66 people aboard were killed.

But in a statement carried by state television, the head of Egypt’s forensic authority, Hesham Abdelhamid, called the reports “mere assumptions” that do not reflect any official position from investigators.

A police official close to the investigation said Tuesday that a small number of bags carrying remains had arrived in Cairo and that “nothing indicates yet what the cause of death could be.”

EgyptAir Flight 804 left Paris late Wednesday night, but lost contact with the tracking system at 2:30 a.m. Cairo time on May 19. Investigators are placing terrorism high on the list of possible reasons the plane crashed. (The Washington Post)

But the official, speaking on the condition of anonymity because he is not authorized to talk to the media, said that some of the bodies had “disintegrated” — suggesting that a blast had occurred.

The conflicting remarks underscore the pressures facing Egyptian authorities after the crash Thursday of the Paris-to-Cairo plane. Officials say all theories remain on the table, but speculation has increasingly focused on the possibility of a terrorist attack.

Such a conclusion by investigators would mark another major blow to Egypt’s battle against militants — including factions linked to the Islamic State — andto the nation’s struggling tourism industry, a critical source of revenue.

The pieces of bodies recovered are small, a senior official told the AP, indicating that a blast probably tore apart the aircraft, scattering passengers and wreckage. However, no traces of explosives have been detected on the body parts, Reuters reported.

More than 20 bags of remains, including 80 pieces, have been retrieved, the agencies reported.

Egypt’s civil aviation minister, Sherif Fathy, said last week that terrorism is more likely to have brought down the Airbus A320 than mechanical failure.

According to the AP, a report published by an organization affiliated with Egypt’s Ministry of Civil Aviation notes that the same plane had made an emergency landing in 2013 after one of its engines overheated.

What we know about the crash of EgyptAir’s Flight 804

Flight 804 had been en route from Paris to Cairo when it disappeared from radar screens over the Mediterranean Sea about 2:30 a.m. Thursday. Automated messages sent from the aircraft in the minutes before the crash said smoke was detected aboard , near the nose of the plane and in one of the bathrooms, French investigators said.

Egyptian President Abdel Fatah al-Sissi said this week that “all scenarios” are being considered in the investigation. The plane was said to have made abrupt turns before plummeting from its cruising altitude of 37,000 feet, according to Greek officials involved in the investigation. The airliner’s last contact was with Greek air traffic controllers, who said the pilots reported no problem.

But the head of Egypt’s National Air Navigation Services Co. said Monday that the plane did not swerve or lose altitude before it disappeared, the AP reported. The reasons for the discrepancy remain unclear.

Egypt is engaged in a battle against Islamist insurgents, including an Islamic State affiliate in the Sinai Peninsula. In October, a bomb smuggled onto a Russian flight departing from Egypt’s Sharm el-Sheikh resort exploded in midair, downing the airliner and killing more than 200 people.

The crash led many nations, including Russia, to halt flights to and from Egypt until security was bolstered at its airports. The EgyptAir flight that crashed last week had flown to the Eritrean capital, Asmara, and the Tunisian capital, Tunis, before landing in Paris.

Islamic State militants also have targeted France, including attacks last fall that killed at least 130 people in cafes and a concert hall in Paris. In March, the Islamic State carried out attacks at the airport and a metro station in Brussels.

Cunningham reported from Istanbul.