Iraqi authorities are investigating the “theft” of $2.5 billion from the tax authority, officials said on Sunday, in the latest corruption case to hit the country. State news agency INA reported on Saturday that an internal probe by the finance ministry found the money had been withdrawn from the agency’s account at a state-owned bank. The ministry has asked the government’s anti-corruption body to investigate, INA said, without naming the officials embroiled in the case. Prime minister-designate Mohammad Shia al-Sudani has vowed to tackle endemic corruption in the country and tweeted on Sunda…