BANGKOK - Thailand's explosive ordnance disposal (EOD) officers on Tuesday found a pipe bomb near the exit 1 of metro station Thailand Cultural Center in capital Bangkok.

A motorcycle taxi driver told police officers of Bangkok's Huai Khwang District Tuesday afternoon that there was a suspicious item hidden in a black plastic bag near the metro station, while it was testified by EOD officers that it is a improvised explosive device, Thai media Komchadluek reported.

Officers have removed the bomb, according to photos taken at scene.

Thailand's police chief Chakthip Chaijinda told reporters that it is still unclear whether the bomb is relevant to the recent three bomb blasts in Bangkok, but officers are investigating the case.

A bomb explosion hit Thai army's Phra Mongkutklao hospital on May 22, which slightly injured more than 20 people and seriously wounded a few others, following a blast outside the National Theater earlier in May and another blast outside the former lottery office in April, which slightly injured two people respectively.