According to shipping documents supplied by Anomeritis' office, the ship was carrying ANFO, an explosive often used in mining and construction. The vessel also carried 8,000 detonators.
The Baltic Sky apparently never headed toward the Suez Canal that would bring it to Sudan.
According to Turkey's Anatolia new agency, the ship passed through that country's Dardanelles strait on May 21 after declaring it was carrying explosives.
Anomeritis said it docked in Istanbul on June 2 and picked up its current captain, 64-year-old Anatoliy Baltak of Ukraine. Anatolia said it left June 5, saying it was headed for the Suez.
But the ship zigzagged across the Aegean Sea and eastern Mediterranean for two weeks before it was boarded by Greek special forces on Sunday in the southern Ionian Sea.
It was taken to Platiyali, a harbor surrounded by hills of olive groves 150 miles northwest of Athens. Security forces guarded the harbor's sole land entrance at a gate more than a mile from the ship.
The ship's history is a study in the workings of the maritime maze.
Greek officials say the 1,717-ton ship is registered to Alpha Shipping Inc. based in the Pacific Ocean nation of the Marshall Islands. Its flag, however, comes from the Comoros Islands, a nation off the southeast coast of Africa that is used by shipping companies as a flag of convenience to avoid taxes and regulations.
The 37-year-old ship built in a Hungarian shipyard was previously known as the Sea Runner and flew a Cambodian flag. It reportedly was detained in Britain last year after failing safety inspections but allowed to sail again after passing them with a new name in March.
According to Anomeritis, the ship was boarded as part of the international war on terror. Greece and other nations had tracked the ship for weeks, he said.
Anomeritis speculated that there might be several reasons behind the ship and its cargo: possibly, it was a terrorist shipment; perhaps a legitimate business deal fell apart; or its crew simply got cold feet delivering dangerous cargo with U.S.-led anti-terrorist efforts in full gear in Sudan and the Horn of Africa region.
''Someone could think that it would have some connection with terrorist groups,'' he told reporters in the port of Piraeus near Athens.
But Anomeritis tersely summed up the state of the investigation so far: ''Who knows?''
He added that the seizure was carried out after Greece communicated ''with all the international agencies and law enforcement organizations.'' He did not elaborate.
Although the ANFO explosives were commercially made and packed in pallets, homemade versions of ammonium nitrate bombs have been the explosive of choice in many terrorist attacks from Oklahoma City in 1995 to last year's Bali bombings.
Used as a fertilizer, ammonium nitrate is harmless. But when mixed with fuel oil, it becomes an explosive more powerful than dynamite.