Lahan, Siraha, Nepal: Lahan, district headquarters of Siraha district remained tense after police and the cadres of the agitating United Democratic Madhesi Front (UDMF) cashed briefly on Saturday. 
 
The clash ensued after UDMF cadres tried to obstruct a rally of the main opposition CPN UML. 
 
As the rally of the UML was moving toward to the Municipal Hall of Lahan Municipality from Pashupati Aadarsha Secondary School, the UDMF cadres had created obstruction in the roads. 
 
With the brief clash, police have taken 18 UDMF cadres into control. Following the arrest, the UDMF cadres are now demonstrating against the UML from outside of the hall. 
 
The local administration has mobilized security personnel heavily to control the untoward incidents.