Two teenagers have been taken to hospital after they were found stabbed at two separate east London stations.
Police were called shortly before 7pm on Saturday to reports of a stabbing at West Ham tube station.
A second teenage boy was found stabbed a “short time later” at Abbey Road DLR station, located around half a mile away, police said.
“It appears that two men met as they passed each other on a stairway at the station,” British Transport Police (BTP) said in a statement.
“Following what seems to have been an altercation between the two men, one male received stab wounds and collapsed at the station.
“The other male, who also received stab wounds, got on to a train to Abbey Road DLR Station.”
Both men have been taken to hospital, BTP said.
No arrests have been made and a crime scene remains in place at both stations.
“Police are asking that anyone who was in or around West Ham Underground Station at about 6.50pm this evening, or at Abbey Road DLR Station shortly afterwards and saw anything suspicious, to please get in touch,” BTP said.
Transport for London said the Abbey Road station was closed due to a “customer incident”, while trains on the Jubilee Line were not stopping at West Ham for the same reason.