They do not think the teenage suspect knew the six-year-old.
Ms Barnfield turned around and saw a woman screaming, “Where’s my son, where’s my son?”.
Visitors quickly gathered around a man who was nearby, she said.
She said the person who was restrained by the public until police arrived “just stood there and was quite calm”.
BBC journalist Jonny Dymond, who was in the gallery when the incident occurred, said visitors were funnelled into a main hall while all exits were closed.
A spokeswoman for the gallery said: “Tate is working closely with the police to help with their investigations.”
“All our thoughts are with the child and his family.”
An open terrace and rooftop bar sit atop the Tate Modern, which is one of London’s most popular tourist attractions.
-with AAP
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