(KUNA) -- Security forces in Bangladesh Tuesday foiled an attempt by suspected Islamist gunmen to kill former prime minister Sheikha Hasina, who was expected to attend a ceremony to mark the 31st anniversary of the assassination of Bangladesh's founding president Sheikh Mujibur Rahman today. Four people were arrested early Tuesday by police while they were allegedly planting two powerful explosives at a building of the Bangabandhu Museum in the capital, Dhaka, dedicated to the memory of founding father of Bangladesh and first Prime Minister Sheikh Mujibur Rahman, news agency Indo-Asian News Service reported. Police claimed the devices were timed to explode during a ceremony.Sheikha Hasina and her sister Sheikha Rehana were expected to attend the ceremony along with other family members at the Museum. In 2004, Hasina escaped an apparent assassination attempt when several grenades exploded while she was speaking at a rally of her party Awami League in Dhaka. At least 23 party leaders and workers were killed and 150 injured in the attack.