Students at St Aloysius College in Milsons Point caught up in muck-up day ...

Another prestigious Sydney school has been embroiled in muck-up day controversy with students allegedly found to be planning a spate of 'criminal' pranks. 

Students at St Aloysius College in Milsons Point, on Sydney's lower North Shore, are the latest to be told they could be expelled or face police action after plans for end of year celebrations were uncovered.

The elite school's rector, Father Ross Jones and Principal Mark Tannock sent an email to all Year 12 students and their parents at the all-boys school condemning the plans.

Some of the challenges at the $20,000-a-year school were labelled as 'inappropriate and concerning activities'. 

Year 12 students St Aloysius College (pictured) in Milsons Point on Sydney's lower North Shore, were found to be engaging in 'very inappropriate and concerning activities' on September 25

Year 12 students St Aloysius College (pictured) in Milsons Point on Sydney's lower North Shore, were found to be engaging in 'very inappropriate and concerning activities' on September 25

The elite school's rector, Father Ross Jones and Principal Mark Tannock sent an email (pictured) to all year 12 students and their parents condemning the disgusting behaviour

The elite school's rector, Father Ross Jones and Principal Mark Tannock sent an email (pictured) to all year 12 students and their parents condemning the disgusting behaviour

'In particular, we have been made aware of an overnight competition that invites criminal, manifestly dangerous, and highly offensive behaviours (a number of which are acutely sexist in nature),' the St Aloysius' leaders wrote, The Sydney Morning Herald reported. 

The pair said the boys should not be excused for their actions under the belief that 'boys will be boys'.

'Clearly, if any student should engage in these activities, the College will have no hesitation in contacting the police and then banning him from the College for the remainder of 2020.

'This will include the voluntary study programs, the Valete Dinner and the Year 12 Formal. Furthermore, it will mean he will be required to sit the HSC examinations as an independent candidate at another examination centre.'

After the initial email was sent out, Mr Tannock (pictured) said some students came forward and apologised for getting involved

After the initial email was sent out, Mr Tannock (pictured) said some students came forward and apologised for getting involved 

After the email was sent out, some students came forward and apologised for getting involved in the activities. 

'Yes, these young men have made a serious error of judgment,' Mr Tannock wrote in another email, The Daily Telegraph reported.

'However, we expect them to grow and learn as a result of our forgiveness and their reflection.'

The strict warning to students at St Aloysius comes after Pymble Ladies College, on Sydney's north shore, also warned its pupils about their muck-up day plans.

A document allegedly circulated among students at the all-girls school encouraged them to 'swallow a goldfish', 'streak down a highway' and to even 'have sex with someone's dad' as part of a graduation challenge.

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