Detectives have already spoken to eight of the 16 people who were travelling on the number 9 bus when the attack took place at 7.37am on Thursday morning.
Det Supt Baker urged the others to come forward and issued a CCTV picture of the suspect and appealed for anyone who saw the man between 6am and 1pm to contact police.
The man, as a black male in his early 20s who was wearing a distinctive "tiger" jacket, is believed to have been on buses in and around the Birmingham area around the time Christina was stabbed.
A 22-year-old man arrested near the scene yesterday is continuing to be questioned on suspicion of murder. Police are not looking for anyone else in connection with the stabbing.
The picture was released as fresh details emerged of the moment Christina was killed. Police revealed that she got on the bus after her attacker and sat on a top-deck seat in front of him.
He then waited until the bus grew close to the next stop, pulled out a knife and stabbed her in the chest before getting up, walking downstairs and waiting patiently until the doors opened for him to disembark.
Today, West Midlands Police took the unusual step of releasing a grainy image of the suspect getting off a bus in the area around the time of Christina's killing.
The man, a British national who is believed to be from a strict Christian family from Mbabane, Swaziland, was arrested a few hours after the attack on suspicion of murder after a chase behind a Morrisons supermarket.
Police say they are not looking for anyone else in connection with the attack.
They are urging anyone who saw him between 6am and 1pm yesterday to contact them, even if they did not witness the killing.
Sixteen people are believed to have been travelling on the bus when the attack happened, but only eight have so far spoken to police.
The suspect, described as black and in his early 20s, was also carrying a white bag, police said.
He is known to have travelled on a number of buses yesterday morning.
Det Supt Richard Baker urged anyone, including the eight people who were on the bus but have not yet come forward to get in touch.
'Even if you think the information you have is not relevant or will not assist us, please let us make that assessment,' he said.
Mr Baker added: 'It is quite possible that the people on the bus who haven't come forward may not have been aware at the time of the severity of what had happened.
'We know from witness accounts that we do have that, although some screaming was heard immediately after the incident, initially people thought perhaps it was just teenagers messing around on the top deck of the bus.'
Det Supt Baker urged the others to come forward and issued a CCTV picture of the suspect and appealed for anyone who saw the man between 6am and 1pm to contact police.
The man, as a black male in his early 20s who was wearing a distinctive "tiger" jacket, is believed to have been on buses in and around the Birmingham area around the time Christina was stabbed.
A 22-year-old man arrested near the scene yesterday is continuing to be questioned on suspicion of murder. Police are not looking for anyone else in connection with the stabbing.
The picture was released as fresh details emerged of the moment Christina was killed. Police revealed that she got on the bus after her attacker and sat on a top-deck seat in front of him.
He then waited until the bus grew close to the next stop, pulled out a knife and stabbed her in the chest before getting up, walking downstairs and waiting patiently until the doors opened for him to disembark.
Today, West Midlands Police took the unusual step of releasing a grainy image of the suspect getting off a bus in the area around the time of Christina's killing.
The man, a British national who is believed to be from a strict Christian family from Mbabane, Swaziland, was arrested a few hours after the attack on suspicion of murder after a chase behind a Morrisons supermarket.
Police say they are not looking for anyone else in connection with the attack.
They are urging anyone who saw him between 6am and 1pm yesterday to contact them, even if they did not witness the killing.
Sixteen people are believed to have been travelling on the bus when the attack happened, but only eight have so far spoken to police.
The suspect, described as black and in his early 20s, was also carrying a white bag, police said.
He is known to have travelled on a number of buses yesterday morning.
Det Supt Richard Baker urged anyone, including the eight people who were on the bus but have not yet come forward to get in touch.
'Even if you think the information you have is not relevant or will not assist us, please let us make that assessment,' he said.
Mr Baker added: 'It is quite possible that the people on the bus who haven't come forward may not have been aware at the time of the severity of what had happened.
'We know from witness accounts that we do have that, although some screaming was heard immediately after the incident, initially people thought perhaps it was just teenagers messing around on the top deck of the bus.'
Source : ITN, DailyMail

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