Police have released images of a young mother's head being beaten against a metal bar on board a bus in a dispute over prams in north London.
The 23-year-old woman was on the 83 bus from Hendon Central to Ealing Hospital on 17 January when she was attacked.
The victim had tried to move her buggy on board the bus when the female suspect spat at her. She complained and was attacked by the male suspect.
The victim suffered a cut to the ear and bruising to the head.
A Metropolitan Police spokesman said the victim was attacked at 1620 GMT in Vivian Avenue after she had moved her own pram out of the way to enable the couple to get theirs into the pram bay.
When she tried to put her own pram back afterwards, the female suspect spat in the victim's face, he added.
He said the victim complained about this, at which point the male suspect attacked her, grabbed her hair and beat her head against a metal bar, before throwing her off the bus and knocking her to the ground.
Police said the attack happened in front of the victim's young daughter on a crowded bus on the lower deck.
Sergeant Brad Crossley, of Barnet borough, said: "The bus was very crowded at the time of this attack, and we are appealing for any of those people on the bus to come to us with further information.
"Also, anyone who recognises the individuals from the pictures we have released would be of immense value in apprehending two dangerous people who clearly had no thought for a young woman and her child."