At least 20 people were injured in two separate explosions in crowded marketplaces in India's north-eastern Assam state Saturday, dpa quoted news reports as saying. Six of the injured were in critical condition, PTI news agency reported quoting police sources. Sixteen people were injured in a powerful explosion in a busy market area of Assam's eastern Tinsukia town, about 520 kilometres west of the state's main city Guwahati, the police said. The bomb was concealed in a sack and strapped to a bicycle parked in the market. Most of the injured were shoppers or vendors, police said. The injured were being treated in hospitals in the town. Four people were injured in another explosion of lower intensity in Guwahati city. The bomb was planted beneath a truck parked in Fancy Bazar, the city's busiest commercial area, the police said.