Popular web-based taxi firm Uber has said it was "truly sorry" for hiking prices as frightened people fled an armed cafe siege in Sydney last week.
The company initially implemented "surge pricing", which increases rates during peak demand, for those exiting Sydney's financial hub as police surrounded a cafe where a gunman was holding hostages.
It reportedly charged customers four times the regular fares to leave the area.
"The events of last week in Sydney were upsetting for the whole community and we are truly sorry for any concern that our process may have added," it said in a statement.
"We didn't stop surge pricing immediately. This was the wrong decision."
After a social media backlash on the day, with some Twitter users calling its actions "a shameful disgrace", Uber offered free rides out of the central business district and said it would refund rides.
"It's unfortunate that the perception is that Uber did something against the interests of the public," the statement said.
"We certainly did not intend to. We will learn from this incident and improve as a result of this lesson."
Three people died in the 16-hour siege, including gunman Man Haron Monis.
Globally Uber has defended surge pricing, arguing it effectively matches supply with demand by encouraging drivers to move to areas where there are shortfalls.
It has, however, had to concede to cap surge pricing throughout the United States during national emergencies after reaching an agreement with regulators.
The Sydney controversy was the latest in a string of bad press for the company.
It is battling lawsuits in several countries for unfair competition and rising anger over drivers who are not properly vetted.
Earlier South Korean prosecutors brought charges against the founder and CEO of Uber and his Korean partner for operating an illegal taxi service.
The prosecutors office said Uber's global CEO Travis Kalanick and a local rental car service operator were indicted for violating a law governing passenger transport services.
Both were not detained, and it was not immediately clear whether Kalanick would visit Seoul for trial.
In South Korea, rental car service operators are banned from conducting passenger transport business using their cars.
Violators face up to two years in jail or a fine of 20 million won ($18,150).
