The alleged coup plot highlights the continuing power struggle between Turkey's ruling Justice Development Party (AKP) [party website, in Turkish] and the country's secular nationalist establishment, the Turkish Armed Forces (TAF) [official website, in Turkish]. Turkish police detained more than 40 people in connection with the plot in February 2010 and continued to bring charges against alleged perpetrators, but released three high ranking military officials [JURIST reports] just days later. The "Sledgehammer" plot is similar to the Ergenekon [BBC backgrounder; JURIST news archive] conspiracy, in which the secular group is suspected of planning to overthrow [JURIST report] the AKP. The Ergenekon group is also alleged to be involved in bombings, political assassination plots and the death of journalist Hrant Dink [BBC obituary]. The probe into the Ergenekon conspiracy has been criticized as an attempt by the AKP to silence opposition and further its imposition of Islamic principles [DPA report; JURIST report] in violation of Turkey's secular constitution [text]. Trials against the Ergenekon group [JURIST report] opened over two years ago with more than 200 suspects in custody. The suspects include journalists, academics, army officers, policemen and Turkish Workers' Party [party website, in Turkish] leader Dogu Perincek [JURIST report].