Police said Saturday that they have found a warning message written in Arabic inside a box recently discovered at Korea's main airport that raised terror alarms in the country.

The message, which was written in Arabic on a sheet of paper half the size of A4, reads, "This is the last warning to you. God will punish."

It was not a handwritten but a printed sentence with some grammatical errors, according to the police, who suspected that it could have been translated by a computer program or by a person whose Arabic skill is not that good.

The discovery was announced a day after the police found a box suspected to contain explosive devices in a men's bathroom in Incheon International Airport.

The area was cordoned off, but no explosives or detonators were found, just with two butane canisters and one bottled water taped to it.

Also found inside the box, along with the warning message, were guitar strings, electric cords, batteries and some pieces of vegetables, the police said.

With the discovery of the memo, the police said that they do not rule out the possibility that a Muslim terror organization might be involved but noted that chances are slim.

The police said that they are currently checking security cameras installed around the restroom in which the box was found. (Yonhap)