The musician - who strongly denies the claims - is currently scheduled to perform with his band at two of the UK's biggest arenas next April Warning: Contains graphic details of alleged sexual offences and misconduct, as well as strong language Women's safety campaigners are calling for Thirty Seconds to Mars' upcoming concerts in the UK to be cancelled after frontman Jared Leto was accused of criminal sexual conduct. A BBC investigation published last week heard from four women who have accused the US musician and actor of behaviour which includes sexual assault and grooming. The alleged offences took place in the 2000s and 2010s when the women were teenagers and Leto was in his 30s and 40s. He is now 54. The musician - who strongly denies the claims - is currently scheduled to perform with his band at two of the UK's biggest arenas next April. The End Violence Against Women coalition and domestic abuse charity Women's Aid have told BBC Newsbeat they have concerns about the upcoming events in London and Manchester - urging organisers not to go ahead with them. BBC Newsbeat has contacted the promoters, venues and the band for comment, but has not received any responses.