Neighbors reported that el-Mashar had recently left Britain, saying he had a visa problem, the Times reported.
The Daily Telegraph said police were trying to identify a man seen standing near the four suspects on the platform at Luton railway station, where they apparently boarded a train for London on the morning of the bombings.
The Evening Standard reported on Wednesday that police had spotted a fifth man on a tape showing the group at King's Cross about 20 minutes before the explosions.
Late on Wednesday, Scotland Yard said anti-terror police had raided a residence northwest of London as part of their investigations into the bombings. No arrests were reported.
News reports have identified three Britons of Pakistani descent as suspects in the July 7 attacks on three underground trains and a bus in London that killed 52 and injured 700.
Britain's Press Association, citing police sources, said that police had identified a fourth suspect but no name or details were reported.
The BBC has reported that a fifth suspect was being sought, citing unidentified sources.
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Bomb victim IDs may take weeks: coroner
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