Five students from Lancaster University have been hospitalised after taking the controversial legal high "Spice", the university has said.
Two of the five students are said to be critically ill, a university spokesperson also said.
"Spice" is a synthetic compound with similar effects to cannabis that has been widely condemned by health professionals.
People with information can contact police by calling 101, alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111.
One of Britain's most dangerous criminals allegedly injured a police officer after dragging him along by a car as he evaded capture.
Brian Thexton, 37, was listed as one of the "unlucky 13" criminals who were thought to be hiding in Spain but wanted in Britain for serious crimes.
However, Thexton, who is wanted over alleged robberies, is believed to have been stopped in Lancaster at 9am yesterday, police said.
An officer pulled a white Vauxhall Insignia over and reached into the vehicle to remove the keys from the ignition when the car was driven away, trapping his arm and dragging him down the road for a short distance.
The police officer managed to release his arm before the car mounted a kerb and narrowly missed pedestrians.
Lancashire police have said no further action will be taken against three men arrested after an investigation into an Islamic school for girls in Lancaster
Police were called to the Jamea Al Kauthar school to investigate claims of sexual assault and false imprisonment.
Detectives executed a search warrant and arrested the three men earlier this month.
Police have said no further action will be taken as "none of the conduct disclosed ... meets the threshold for criminal prosecution".
Two men were bailed and one released without charge after allegations of sexual abuse and false imprisonment were reported at an Islamic school.
The three men were arrested after an incident was reported at the Jamea al Kauthar school in Lancaster on Saturday.
Superintendent Andy Webster of Lancashire Constabulary has said that searches are ongoing at an Islamic school for girls following reports of sexual abuse, but that it is being treated as an "isolated incident".
He added that detectives were trying to identify the alleged victims and that it is not known whether they are current or former pupils at the school.
Police investigating sexual abuse claims at an Islamic girls' school in Lancaster have set up dedicated phone lines for concerned families, both in the UK and abroad.
Three men were arrested at the Jamea al Kauthar school after an incident was reported to police on Saturday.
The number for parents in the UK is 0800 092 0410 and for those calling from outside the UK call 0207 158 0124.”
The Jamea al Kauthar school in Lancaster, which is being searched following reports of sexual assault and false imprisonment, is a private boarding school for Islamic girls.
It continues: "We provide an opportunity to study the traditional sciences concurrently with secondary and further education.
"Jamea al Kauthar also offers the 'Tahfeez Ul Quraan' programme [committing the whole quran to memory] and a two year abridged version of the Islamic Teaching programme in the English medium."
Police have arrested three men on suspicion of sexual assault and false imprisonment within the grounds of an Islamic girls' school in Lancaster.
A 40-year-old and 30-year-old man have been arrested on suspicion of sexual assault and false imprisonment and a 53-year-old man has been arrested on suspicion of false imprisonment. All three are currently in custody.
Searches are being conducted at the school by female officers.