A British man was stabbed to death and another injured in an attack in Jerusalem, the Foreign Office has said.
There were reports of unrest in Jerusalem after the attack
Shmuel Mett, 21, and fellow Jewish religion student Sammy Weisberg were attacked in the Old City area on Wednesday evening.
Reports said the men were attacked by a Palestinian with a kitchen knife.
It is the first deadly assault in the area in three years and came as four Palestinians died in a gunfight with Israeli troops in the West Bank.
Unrest has been reported in the area and the incident has raised tension in Israel.
Israeli newspaper Yedioth Ahronoth said the stabbing happened at about 8.30pm as the pair were walking with a third man from the Western Wall (the so-called Wailing Wall) along a shopping street.
Mr Mett was taken to Hadassah Hospital, while police closed off gates to the Old City and shops as they searched for an attacker.
The Foreign Office said Mr Weisberg remained in hospital on Thursday.
Internal security minister Gideon Ezra said it was believed the killing was the work of a lone attacker, the AFP news agency reported.
"Without doubt, this attack was committed by a lone Palestinian who was not part of any movement, which will make the search for him more difficult," he was quoted as saying.
BBC correspondent in Jerusalem Jim Fish said: "The incident has raised tension in Israel.
"Although no suspect has been arrested, Israeli media reports, based on eyewitness accounts, described him as a Palestinian.
"If that turns out to be true, it will be the first such killing in the Old City for three years.
According to reports on Israel Radio, he said, dozens of ultra-Orthodox Jews burned tyres and threw stones at police in Sabbath Square in Jerusalem after news of the murder broke.
On Thursday morning more disturbances were reported in Geula, one of the ultra-Orthodox neighbourhoods of the city.
The violence is the first since Israeli forces completed the withdrawal of Jewish settlers from Gaza and part of the West Bank.