At least 20 people were injured on Monday in a sporadic clash between activists of ruling Awami League (AL) and opposition BNP during the observance of Language Martyrs Day in Raipur upazila of Lakshmipur district.Of the injured, 13 were admitted to the Upazila Health Complex.The two-hour chase and counter-chase started around 9am on Monday which  in front of the Dak-bungalow and Upazila Health Complex areas. Read: 8 hurt in BCL infighting in Ctg over offering flowers at Shaheed Minar