The brothers are 5 and 8 years of age.
It's believed two children missing from Northern Ireland could be in the Republic.
The PSNI is growing more concerned about the welfare of the brothers from north Belfast.
Police increasingly concerned about missing brothers from north Belfast.https://t.co/WFmBlqaJ1a pic.twitter.com/G8WlaSiKvV
— Police Belfast City Centre (@PSNIBelfast) May 16, 2021
Cliona O'Dwyer reports:
"Five year-old Patrick Hovarth and his older brother, Fabricio who's 8 were seen getting into a black Ford car around 6 o'clock on Friday evening in the Limestone road area of Belfast.
Police in the North are appealing to the public for help in finding them - both boys are dark-haired.
Younger brother, Patrick, was wearing light-coloured bottoms and a top with black shoes. Fabricio was wearing grey bottoms and a purple and green top.
The PSNI believes they may be in the company of a relative in the North or possible in the Republic, particularly in Dublin.
They're appealing to that person to get in touch with police as soon as possible.
They're also urging members of the public who have any information about the boys or have seen them since Friday evening to contact police immediately. "

Coimisiún Na Meán In Contact With Tik Tok Following Social Media Posts Of Dangerous Driving
Staff At Oberstown Children Detention Campus Continue Protests Over Safety Issues And Resourcing
Social Media Could Change Forever If Meta Loses US Legal Battle, Says Experts
GRA Welcomes Announcement Of Pursuit Training For Garda Members Following M9 Crash In Moone
Unions Say Teachers Are Overwhelmed With Paperwork
Nationwide Reaction Following Kildare M9 Collision That Resulted In Five Deaths And Four Being Hospitalised
Two Teenagers To Stand Trial For Murder Charges That Allegedly Took Place In Blanchardstown Earlier This Year
ETBI Says Almost 300 Primary Schools Should Consider Change To Multi-Denominational Patronage