(UPDATE 2) Presidential daughter and Davao City Mayor Sara Duterte said Thursday she lost two of her babies, three days after the deadly blast in Davao City.

An emotional Duterte, who was expecting triplets, said two of the babies no longer have heartbeats. She learned of the babies' condition after a flag raising ceremony on Monday.

Speaking at the turn-over ceremonies of Task Force Davao, Duterte said was not feeling well on Monday and sought her doctor's help.

"Lunes, buong araw iyak ako ng iyak. I lost my identical twins [I've been crying all day last Monday," she said.

"Nag-arrest na heartbeat sa identical twins but one is still fighting," she added.

She said the doctors cannot say yet what caused the fetal deaths.

"Actually daghan siya [doctor] gisulti but they really cannot say what happened," she said.

(The doctor said a lot of things but they really cannot say what happened.)

Duterte said the two fetuses will not be extracted from her womb yet because this might affect the surviving baby.

"Dili because naa pa isa e. So dili nila puwede tandugun because maaapektuhan ang isa. So pasagdan lang sila," she said.

(The two fetuses will not be extracted because the other one is still alive. They cannot move the two because the other one will be affected. They will just leave the fetuses there.)

READ: Sara Duterte on losing 2 babies: I put my trust in God

On September 2, Duterte appeared in public for the first time since July, as she led some 500 mourners after the deadly Davao City blast that left 14 dead.

Duterte stood firm that the city must "not be terrorized" by the blast, as she called Dabawenyos "to unite and let us help each other rise from this senseless incident."

When she announced her pregnancy in August, Duterte said "it's been a difficult pregnancy so far" and was advised by her doctors to rest.

She however vowed to continue working as the city's chief executive as long as her health permitted so.

"The human body is made to carry just one baby and I am experiencing threefold all the pregnancy symptoms that a woman goes through." Duterte had said.

"I will continue to work until I am allowed by the doctors to do so, however, I have been advised to avoid crowded places to lessen the chances of acquiring infections," she added.

Sara is married to lawyer Manases Carpio. They have two kids, Sharky, 7, and Stingray, 3.

-- With reports from Paul Palacio, ABS-CBN News