A college student was arrested in Southeast Asia this week in connection with a fake bomb threat that delayed a Singapore Airlines, according to CNN Indonesia.

The 21-year-old was detained in Tangerang, Indonesia on Tuesday, six days after he sent an email and a series of threatening tweets to the airline.

The suspect singled out Sydney, Australia-bound Flight SQ221, which was scheduled to depart from Singapore Changi Airport on July 1.

The flight wound up being delayed for several hours while authorities searched the aircraft.

The threats, which can be read below, also resulted in two other outbound flights at Changi Airport being delayed.

HI @SingaporeAir, DO NOT FLY THE PLANE EX. SQ221 TODAY (1/7)

— SatNoToLGBT (@SatNoToLGBT) July 1, 2015

@SingaporeAir WHY? BECAUSE I'VE JUST PLACED A BOMB THERE (3/7)

— SatNoToLGBT (@SatNoToLGBT) July 1, 2015

@SingaporeAir SO, IF YOU WANT YOUR PASSENGERS SAFE, DO NOT FLY IT (4/7)

— SatNoToLGBT (@SatNoToLGBT) July 1, 2015

Declining to comment on the incident, Singapore Airlines only said that "the matter is the subject of an ongoing police investigation."

The student faces a maximum penalty of six years in prison and the possibility of a $75,000 fine.

The bomb hoax is the latest in a slew of threats made against major airlines, many of which have impacted U.S. carriers. Earlier this week, an "undisclosed security threat" grounded an American Airlines flight in Charlotte, North Carolina, and last month a Delta Air Lines flight was searched at Newark Liberty International Airport following a bomb threat.

On Tuesday, a Turkish Airlines flight made an emergency landing in India after a bomb threat was found written on the plane's bathroom mirror. 

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