Detectives said they were hoping to create a DNA profile of whoever killed the teenagers.
Detectives said he was heading to Copdock where Miss Nicol's body was later found.
But detectives said it left the woman so traumatised that she only came forward last week.
Detectives said Mr Guidera had travelled on the 2117 GMT train from Bickley to Penge East.
Detectives said the men may have taken a taxi after dumping their getaway motorbike.
Detectives said the search was focused around the Kingsway and Latchford areas of Warrington.
On Sunday, a man aged 28 was taken in for questioning on the same offence, detectives said.
Detectives said the charges related to a school, which cannot be named for legal reasons, in Oxfordshire.
Before coming to the home, he sent photos of himself to the undercover officer, Florida detectives said.
Detectives said they had now traced a driver and a vehicle suspected of being involved in a crash.
He had recently been released from prison after shooting a man on New Year's Day 2008, detectives said.
Detectives said he also taught at schools in the Tyne and Wear area between 1968 and the early 1970s.
Detectives said they were now focusing on the area around Gas House Road.
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Jamie Starkey had recently been released from prison after shooting a man on New Year's Day 2008, detectives said.
Following a case review, detectives said they wanted to make a fresh appeal for information and identify the men.
Detectives said a team of officers was looking for two men wearing hoods who left the scene in a dark-coloured car.
Detectives said only three of the bone fragments found could be human, and two of these were hundreds of years old.
Detectives said the 32-year-old, of Park Terrace, Winlaton, was well known in the area due to his "long hair and beard".
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Detectives said some of those taken ill were students at Newcastle University.
Detectives said they were following all lines of enquiry at the moment.
Detectives said damage to about 150 cars had been reported to them so far with more incidents coming to light on Thursday morning.
Members of the Parachute Regiment shot Joe McCann several times as he ran away from police in Belfast, a team of detectives said.
The restaurant refused to serve the underage informant but the detectives said they witnessed a waitress continue to serve a pair of intoxicated patrons.
Detectives said they needed to hear from any witnesses or anyone who was in the St Peters Street area in the early hours of Saturday.
Detectives said he was dropped off by a taxi in Edgeley after a night out with friends in Manchester city centre and assaulted minutes later.
In March 2002 detectives said no charges would be brought over the death of Mr Lubbock, though a file had been prepared for the coroner.
Detectives said they wanted to trace Mr English's movements on Saturday night into Sunday morning to find out where he went and who he was with.
Detectives said they were treating the attack as attempted murder.
Detectives said at the time they were tracking down dozens of possible suspects from the murder files - some of whom who have moved as far away as Australia.
Detectives said they believed the suspect was white, of medium to heavy build, and was wearing dark clothing with a black hat or hood and a sleeveless, yellow high-visibility jacket.
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