Birju Kishore Salla, 37, a resident of Mumbai, was on Monday detained by the crime branch following the emergency landing made by the Mumbai-Delhi Jet Airways plane at the Ahmedabad airport after the pilot was alerted about the alleged note which was found in the plane's washroom by a cabin crew member.
After formally arresting the jeweller on Tuesday, the Ahmedabad crime branch requested the National Investigation Agency to take over the probe.
He was arrested under the stringent Anti-Hijacking Act, which came into force in July replacing the 1982 vintage law.
"We have formally arrested him under the Anti-Hijacking Act sections. This is the first arrest under the act after it came into force," Joint Commissioner of Police-crime J K Bhatt told reporters.
Bhatt said they have sent a letter to the NIA, requesting them to take over the investigation in the case.
"Given the serious nature of the offense, we have kept the NIA as well as other central agencies in the loop about the ongoing investigations. Today, we have sent a letter to the NIA, requesting them to take over the probe. The agency would take a call and will inform us accordingly," the joint commissioner said.
Under the provisions of Anti-Hijacking Act, an accused could face a maximum punishment of life imprisonment till death and his movable and immovable properties can be confiscated, the police said.
Salla is a native of Dedan village under Khambha taluka in Amreli district and settled in Mumbai since many years.
"Salla was detained from the plane which made an emergency landing at the city airport last morning. Later, he confessed that he had prepared the threat letter using his laptop and printer. He used Google translator service to convert the English text into Urdu," he said.
The note, allegedly placed by Salla, stated that there were hijackers and a bomb in the cargo area, officials earlier said.
It was a printed note in Urdu and English, asking that the plane be flown straight to PoK (Pakistan-occupied Kashmir). It ended with the words, "Allah is Great".
The reference to PoK made investigators suspicious because Pakistan-based terrorists call the area 'Azad Kashmir', an official said.
According to Bhatt, Salla is a multi-millionaire jeweller having his office in the Zaveri Bazar area of Mumbai and a flat in a posh locality of the metropolis.
He said Salla confessed to the crime branch sleuths that he planted the note with an intention to close down Jet Airways operations so that his girlfriend, working in the Delhi office of the airline, loses her job and shifts to Mumbai.
"Salla, who is married and has two children, claimed that his girlfriend works with Jet Airways in Delhi. Since she was not ready to change her job, he came up with this wild idea of putting a threat letter, wishing that it would shut the airline's operations and his girlfriend would be left with no other option than to come to Mumbai," Bhatt said.
"Salla, a frequent flier between Mumbai and Delhi, was in the habit of harassing the airline. Earlier, he allegedly put a cockroach in the meal served to him on one of the flights," he said.
The police have seized the laptop, printer and some pen drives used by Salla, Bhatt said.
Though the police have not found any criminal record of Salla, the crime branch is probing the case from all angles, he said.
"One of our teams has already reached Mumbai with Salla to get more information about him. We are investigating if he is in contact with any anti-social groups," Bhatt said.
The official said they were in touch with the NIA.
He said Salla's female friend will also be questioned.
According to the police, Salla has been arrested under sections 3(1), 3(2)(A) and 4(B) of the Anti-Hijacking Act.
Section 3(1) of the Act pertains to "whoever unlawfully and intentionally seizes or exercise control of an aircraft in service by force or threat, thereof, or by coercion or by any other form of intimidation or by any technological means he commits the office of hijacking."
Section 3(2)(A) is invoked against a person who "makes a threat to commit such offence or unlawfully and intentionally causes any person to receive such threat under circumstance which indicate that the threat is credible."
As per section 4(B), "whoever commits such an offence shall be punished with imprisonment for life which shall mean imprisonment for the remainder of that person's natural life and with fine."
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