The two men were detained when a team of police and soldiers raided the Maimuna Garden Home Apartment building in Min Buri district for the second time on Sunday evening.
The same apartments were raided on September 2 when security forces found bomb-making materials in Room No.9106 rented by Wanna Suansan, a Thai-Muslim woman wanted on suspicion of involvement in the August 17 Erawan Shrine bombing and the explosion at Sathon pier the following day.
An official said that authorities searched the apartment building again, acting on the information that some people believed to be involved in the bombings might still be there.
Two people whose identities were not disclosed were apprehended from one room. Both were carrying an Indian passport. They were taken away by military officials for questioning.
The raid came after investigators examined more surveillance camera footage from the apartment building. They discovered that the two Indians had frequently talked to Yusufu Mieraili, the 25-year-old man detained in Sa Kaeo province on September 1 while attempting to enter Cambodia.
The two were being questioned to find out what they talked about with the suspect and if they were involved in the bombings, the official added.