Suspect claims in judicial court that Mashal had allegedly committed blasphemy.
The nine critical injured including four officials of Khasadar militia of the blast were flown to Peshawar.
The university's security in charge is the main accused in Mashal's murder, police say.
The decision to hide the shooter's identity was taken as a group.
University administration convened a meeting in which the accused was asked to testify against Mashal Khan.
"I never heard any unparliamentary, scandalous or blasphemous words from Mashal's mouth," Abdullah says in statement.
The victims were on their way home after attending a hearing in a local court when unknown assailants attacked them.
DIGP Mardan says investigation proceeding at fast pace.
The CM approved summary of a judicial inquiry into the lynching of Mashal Khan.
Day after student's murder, notification posted by university says three students will be investigated for blasphemy.
Police start investigating Mardan lynching, eight arrested so far; father of victim looking to govt for justice.
At least 45 people arrested; university shut down until further notice.
Aircraft partially damaged but pilot safe: security sources.
The special force will initially comprise 4,200 security personnel deputed from different law enforcement agencies.
Kalash community appreciates court's decision to include religion on census form prior to second phase starting April 25
Bomb planted by roadside targeted security forces vehicle, says official.
The marketplace is a busy area and has several shops.
Mehsud was the junior of three officers whose name was forwarded by the provincial government to the federal government.
Kohistan video case: Peshawar High Court orders release of six men accused of killing three brothers
Court over-ruled decision by Kohistan sessions court, ordered release in a short verbal decision.
The necessary amendments should be made before the second phase of the census, the court orders.