A man was sentenced to 18 months in prison in Chongqing municipality in China on Friday, two years after he tried to blackmail police by threatening to plant bombs in public areas.

Surnamed Tan, the man from Santai county, Sichuan province, left three posters on bus stops in Yubei district in September 2007.

He wrote that the police bureau must wire 500,000 yuan ($73,206) into his bank account otherwise he would trigger explosions.

After receiving the report from residents who saw the notices, police sent money to Tan’s bank account.

He was arrested when he tried to withdraw the money.