Two groups of lawbreakers blocked Shaikh Khalifa bin Salman Highway – from Seef flyover – and Shaikh Salman bin Khalifa Highway –from Isa Town flyover, pouring a big quantity of oil to disrupt the traffic. They also used iron chains to block both sides of Shaikh Salman bin Khalifa Highway. Police arrested several suspects, with some caught re-handed, Northern Prosecution chief Nawaf Al-Awadhi said. They were then ordered to be kept in custody pending investigation.