Thailand has freed three Iranian men jailed over a 2012 bomb plot following the release of British-Australian academic Kylie Moore-Gilbert by Iran. Iranian media say the releases are part of a swap for the lecturer, who was held on spying charges she denies. Two Iranians had been deported, while a third was pardoned in August, Thai officials said. The botched bombing in Bangkok was apparently aimed at Israel. Ms Moore-Gilbert said leaving Iran after two years was "bittersweet". Australian Prime Minister Scott Morrison described her release as a miracle, saying she seemed in good spirits when he spoke to her. "The injustice of her detention and her conviction, Australia has always rejected, and I'm just so pleased that Kylie's coming home," he told local network Nine. Mr Morrison declined to comment on whether a swap had taken place, but said no-one had been released in Australia. His government has been silent on the circumstances surrounding the deal, and some observers have said it could encourage Iran, which is accused of "hostage diplomacy". According to Thai authorities, the three Iranians were not exchanged with anyone. The kingdom's Department of Corrections said Masoud Sedaghatzadeh and Saeid Moradi were transferred back to Iran on Wednesday under a mutual treaty on prisoners. It named the third man freed as Mohammad Khazaei, saying he had received a royal pardon in August and was released in September. The trio had been jailed over a plot that Israel said was aimed at its diplomats. It came to light when bombs apparently detonated by accident in a house in suburban Bangkok on 14 February 2012. Moradi was jailed for life for attempted murder after he threw a bomb at police as he tried to escape. He lost his legs in one of the explosions. Khazaei, who was detained at the airport, was jailed for 15 years. Sedaghatzadeh fled to Malaysia and was later extradited to Thailand.