Bangkok: Police in Thailand have released a married Iranian couple detained for suspected involvement in bombings in Bangkok earlier this month.

A blast occurred Feb 14 in a residential building in Bangkok. Three Iranian citizens who were renting the house tried to escape after the incident. Two of them were detained in Thailand and one in Malaysia.Three more suspects -- two men and a woman -- were detained on Sunday.

A married couple, Rahimi Radiraj and Mahbub Tasbehi, were released on Monday after questioning revealed they had no links to the blasts, The Nation reported on Tuesday.

The third suspect -- 33-year-old Madani Seyed Mehrded -- was detained for overstaying his two-month tourist visa and remains in custody.

Thai police believe Mehrded was seen in front of the building housing the Israeli embassy on the day of the bombing. Authorities were holding two suspects -- Mohammad Hazaei who was arrested Feb 14 at Bangkok's international airport as he tried to board a plane to Malaysia, and Saeid Moradi, whose legs were blown off by his own bomb.Masoud Sedaghatzadeh, 31, was arrested the next day by Malaysian authorities.

A fourth suspect, an Iranian woman accused of renting the house where the first device exploded, has already returned to Iran.

Thai police are searching for a fifth suspect -- a 52-year-old Iranian passport holder Nikkahfard Javad -- who might have given bomb-making training to the other suspects.

The blasts in the Thai capital came a day after an Israeli diplomat's car was blown up in New Delhi, injuring two people, and Georgian security services defused a bomb at the Israeli embassy in Tbilisi.

Israel accused Iran of plotting the three attacks, but Tehran denied the accusations.