• Isa Balado was reporting on a Madrid robbery on Tuesday when he walked up and appeared to touch her bottom, which he denied when she confronted him.
• Ms Balado tried to continue, but was interrupted by the programme's host.
Spanish police have arrested a man on suspicion of sexually assaulting a journalist after he allegedly touched her while she was live on TV.
Isa Balado was reporting on a Madrid robbery on Tuesday when he walked up and appeared to touch her bottom, which he denied when she confronted him.
Ms Balado tried to continue, but was interrupted by the programme's host.
"Isa, forgive me for interrupting you... but did he just touch your bottom?" Nacho Abad asked.
The reporter confirmed it, and Mr Abad told her to put the "idiot" on camera, to which the shot moves to show both Isa Balado and the man, who was still standing with her, smiling and laughing.
"As much as you want to ask what channel we are from, do you really have to touch my bottom? I'm doing a live show and I'm working," Ms Balado told him.
The man then denied touching her, and as he walked away attempted to tickle her head.
Police later said a man had been arrested for allegedly assaulting a reporter while she was doing a live television show, in a message posted on X, formerly Twitter.
Mediaset Espana, which owns the news channel, issued a statement expressing its support for Ms Balado after the "absolutely intolerable situation" she suffered, and that it "categorically repudiates any form of harassment or aggression".
Spain's Labour Minister Yolanda Díaz also spoke out over the incident, saying it should not go unpunished. She wrote on X: "It is machismo that makes journalists suffer sexual assaults like this, and the aggressors are unrepentant in front of the camera."
This incident comes amid a sexism row in Spain, sparked by the former Spanish FA president Luis Rubiales kissing World Cup winner Jenni Hermoso on the lips.
His actions during the Women's World Cup final led to widespread criticism, his eventual resignation and a summons to court over accusations of sexual assault and coercion.