The attack comes ahead of Duterte's visit to an area of intense battles between Islamists and government troops.
Brigadier General Restituto Padilla, spokesperson for the Armed Forces of the Philippines, told local media groups that the blast took place when a convoy of the presidential security guard and military personnel were headed to Marawi. "There was no firefight".
The ambush occurred as the convoy arrived at an army checkpoint barricade prior to entering the city, Marawi City information officer Alexander Alag said.
"A presidential chopper immediately airlifted the seriously injured and four others for emergency care". The troops were part of the advance party for the President's visit.
Duterte said he would push through with his scheduled visit in Lanao del Sur on November 30.
"The advice was to postpone".
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"Kung hindi ako lulusot (If I don't make it), we have VP Leni", he said.
PNP Chief Ronald Dela Rosa then stated on Monday that Maute, an Islamist terrorist organization based in the Philippines' southern island of Mindanao, could have planted the bomb so authorities would divert their attention from their hometown.
On Monday, Philippines police found a homemade bomb in a trash bin near the U.S. embassy in Manila.
Before boarding his vehicle, reporters asked Duterte what he would do about the Maute group, which he himself has linked to the Islamic State of Iraq and Syria (ISIS). Explosives experts successfully conducted a controlled detonation of the bomb. The military says about 40 militants have been killed and several soldiers have been injured in the offensive.
In April 2016, the group abducted six sawmill workers from Butig, two of whom were later found beheaded, and on October 4, three men linked to the group were arrested in connection with a 2016 bombing in Davao City - Duterte's hometown.