Dhaka, Jan 07 (ANI): Bangladesh government arrested a key opposition figure and deployed thousands of police as opposition protests entered a second day, after four activists were killed and scores were injured on the first anniversary of last year's disputed polls. The government of Prime Minister Sheikh Hasina cracked down on displays of anti-government sentiment in the capital, Dhaka, as opposition leader Begum Khaleda Zia stepped up calls for fresh elections. Police used tear gas and rubber bullets to scatter protesters in Dhaka and elsewhere. Acting Secretary General Mirza Fakrul Islam Alamgir of Khaleda's Bangladesh Nationalist Party (BNP) was detained on Tuesday as he stepped out of Dhaka's National Press Club, where he had taken shelter, police said. Before being detained, Alamgir said there was no democracy left in Bangladesh. On Monday, Khaleda, who said she had been unlawfully detained inside her Dhaka office since the weekend, called for an indefinite nationwide transport blockade after the government foiled rallies by her to mark the election anniversary, which it had dubbed "democracy killing day." However, leader of ruling Awami League said Khaleda Zia was providing safe haven to militants.