The five people who arrived in Bangladesh's Shapuree Dwip from Myanmar on Saturday were sent back by the Border Guard Bangladesh (BGB).
The five Myanmar nationals, including a woman with bullet wounds, were sent back on Sunday morning.
However, despite tries, no official comment from the BGB could be obtained.
Meanwhile, the sound of gunfire was heard on the other side of the Naf River at around 10am on Sunday, said Abdus Salam, UP member of ward no 9 of Shapuree Dwip.
Meanwhile, on Saturday, fear gripped the residents of Shapuree Dwip in Teknaf as intermittent explosions were heard due to the clashes and firing between the Arakan Army and the armed forces in Myanmar's Rakhine state.
BGB and Coast Guard members are strictly patrolling the Naf River area to prevent any more infiltration from the other side of the border.
