In elections in March, the United Patriots (UP) alliance -- made up of three parties, the VMRO, NFSB and Ataka -- emerged as the third-biggest force with 27 lawmakers in Bulgaria's 240-seat parliament.
The United Patriots, which includes the anti-Semitic Ataka ("Attack") party, stoked anti-immigration sentiment to come third in the elections while also railing against Muslims, Roma and gay people.
With ties dating back to Ottoman times, the 700,000-strong minority makes up 10 percent of Bulgaria's population, proportionately the largest native Muslim community in a European Union member.
Russia's Lukoil, Anglo-Dutch Shell, Austria's OMV, Greece's Hellenic Petroleum, Serbia's Nis Petrol and Bulgarian Petrol - -- which control 70 percent of the petrol and 55 percent of the diesel market -- had been targeted in the lengthy probe launched last February.
Around 250,000 fewer Turkish-origin Bulgarian citizens were able to vote because of obstacles, says head of Balkan society
Bulgaria, where the average monthly salary is just 500 euros ($540) and corruption is rife even after 10 years in the EU, has now seen three elections in four years.
Election occurs amid dispute with Ankara over attempts to prevent Turkey-based Bulgarians from crossing border to vote
Turkish deputy prime minister says Bulgaria should ensure citizens can vote in peace
Central Election Commission pulls Turkish-language broadcast days before voters go to the polls
Turkey-based Bal-Goc throws its weight behind DOST party which campaigns for ethnic Turks in Bulgaria
Bulgaria is home to a 700,000-strong ethnic Turkish minority, a legacy of the Ottoman empire.
Ankara is locked in an escalating row with several EU countries over their blocking of Turkish ministers from holding rallies ahead of a Turkish referendum.
The leftwing BSP, heir of the former communist party, has slightly edged ahead in the race with 30.2 percent while the GERB party of ex-premier Boyko Borisov polls 28.3 percent, according to the Gallup survey of 1003 voters.
Turkey blasts Bulgarian move to limit ballot boxes in Turkey for its March 26 elections as 'contrary to the European system'
Movement for Rights and Freedoms' decision to select Attack party candidates criticized
The scheme has proven so successful that Bulgarian gangs are now also targeting neighbouring Greece, where people have been stashing even bigger sums in their homes following the financial crisis.
Bulgaria's new president on Tuesday called for an early national election for March 26 and appointed former parliament speaker Ognyan Gerdzhikov as caretaker prime minister until then.
Radev becomes country 5th president
Traffic chaos has caused people in Bulgaria to force a train to stop in order for an earlier train to leave first
As an ex-Soviet ally reliant on Russian energy, the EU's poorest member state is walking a tightrope between Brussels and Moscow, which seeks to expand its influence in former communist nations.