Source: BBC News
Several severed pigs' heads have been found in mosque compounds in the Malaysian capital, Kuala Lumpur.
The national police chief, Musa Hassan, linked the discoveries to recent attacks on various houses of worship.
Pigs are considered unclean by Muslims and their presence in the mosque compound will be taken as an insult.
In recent weeks, 11 churches, one Sikh temple and some Muslim prayer halls have been vandalised amid a row over non-Muslims' use of the word Allah.