Countries including Kenya and Ethiopia have offered to send medical aid in response to what Somali's government called a "national disaster", information minister Abdirahman Osman said.
Blood donation drives are ongoing in Somalia where officers of the African Union Mission in Somalia (AMISOM) have also been donating since Monday.
Medical supplies provided by foreign governments in the early days could mean the difference between life and death, said Adem, noting that the death toll from the attack had been rising.
Analysts still believe there is little doubt the Islamic extremist group carried out the bombing, one of the deadliest in sub-Saharan Africa.
Earlier this year, it vowed to step up attacks after both the Trump administration and Somalia's recently elected Somali-American president, Mohamed Abdullahi Mohamed, announced new military efforts against the group.
Angry protesters gather near the scene of Saturday's massive truck bomb attack, near the presidential palace, in Mogadishu, Somalia, Sunday, Oct. 15, 2017.
Somali children assist other civilians and security forces in their rescue efforts by carrying away unidentified charred human remains in a cardboard box, to clear the scene of Saturday's blast, in Mogadishu, Somalia, Sunday, Oct. 15, 2017. The death toll from the most powerful bomb blast witnessed in Somalia's capital rose Sunday to at least 189 with more than 200 injured, making it the deadliest single attack ever in the Horn of Africa nation, police and hospital sources said.
- with files from the Associated Press.
Saturday's explosion hit a busy junction in Mogadishu killing civilians including doctors and students.
"This funding has been channelled through UN agencies, the Red Cross/Red Crescent Movement, and non-governmental organizations to help provide food, water and sanitation, treatment for acute malnutrition and other medical support, shelter, and protection to those in need", she said.
"At this time, the government of Somalia has not made any specific request of Canada", spokeswoman Brittany Venhola-Fletcher said in an email Monday afternoon.
In a tweet, U.N. Secretary-General Antonio Guterres said he was "sickened" by the attack, and his spokesman urged all Somalis to unite against extremism and work together to build a "functional" federal state.
"It's a dark day for us", he said.