World number three Alcaraz, 20, missed a month prior to Madrid with a forearm issue
A military report said the attack occurred at 5:50 a.m. local time in a village in Lamitan City on Basilan, an island province off Mindanao.
The incident report said a "white van" was detonated at a military checkpoint in Colonia village in Lamitan City.
"While troops were conducting an ocular inspection, the van suddenly exploded which resulted (in) the death of one soldier and four (militia men) and wounding of two other militia men," Xinhua quoted the report as saying.
The military said the Abu Sayyaf militants may have been behind the attack.
Authorities said the group, which was set up in the 1990s, is thought to be holding a number of hostages which they keep in the jungles of Basilan and Sulu, their stronghold.
The Abu Sayyaf helped the Maute militants in attacking Marawi City in May last year, triggering a five-month fierce battle that left more than 1,200 dead.
World number three Alcaraz, 20, missed a month prior to Madrid with a forearm issue
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