Police are appealing for information after a Nelson mosque was targeted by burglars last Sunday.
The burglary took place around 10-45pm at the Al-Hira Mosque in Seldon Street.
Police believe those responsible used a flat-bladed instrument to get in through the front door while a man was alone studying in the mosque building.
A safe containing around £500 of cash in charitable donations was stolen.
When the offenders have tried to force their way into more office rooms, they were disturbed by the man and made off. It is believed there were at least two offenders wearing black clothes and balaclavas.
Officers are asking anyone with any information come forward.
PC Carley Gaynor said: “I would appeal to anybody that may have seen anyone acting suspiciously or with any information about this burglary to come forward and speak with Lancashire Police on 101.
“I would also encourage people attending other mosques in the local area to be extra vigilant and to ensure all buildings are secured appropriately at all times.”
“This is a serious offence and I’d urge anybody with information about anybody they suspect could be involved to contact police in confidence.”
People with information can also contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at Crimestoppers-uk.org. No personal details are taken, information is not traced or recorded and you will not go to court.