The girls, Maryam Salisu, Bahayura Lawan, and Lawisa Sule, were between the ages of eight and 10 years.
A resident of Oke Oka told Peoples Gazette that the incident has already caused apprehension among the residents.
The outpost is in collaboration with the residents of Muhammad Bashar Housing Estate Katsina, so as to enhance security in the area.
The NSCDC and EFCC commands in Kwara have intensified joint efforts to tackle illegal mining activities in the state.
NEMA urged parents and guardians to caution their wards and children against swimming in the river to avoid drowning.
The suspected vandals, nabbed on August 26, are Waheed Ganiyu and Mojeed Afolabi.
The warning is in connection to the frequent rains in August, which would last till the end of September and even part of October.
Four of the suspects were said to have stolen and sold 84 pieces of aluminium windows.
The championship will kick off on Tuesday at the Moshood Abiola Stadium in Abuja and end on September 10.
From 5,010 upgraded operatives, 4,494 were promoted, while 516 were upgraded by conversion to assistant superintendent of corps II (ASC II).
