The fresh casualties brought to 58 the number of government troops killed in the fighting, Herrera said.
The Agence France-Presse news agency reported the military as saying that the militants occupied about 10 percent of the city and were using bomb-proof tunnels and anti-tank weapons.
Immediately, the entire city became a battleground while more than 2,000 were stuck in the crossfire after thousands were evacuated.
Herrera said Farhana has been transported away from Marawi City to a "safe place", and is now currently undergoing investigation.
Temporary martial law has been declared for 60 days in Mindanao, one of the three main islands in the Philippines.
The announcement of U.S. help in the embattled southern region comes after Duterte has sought to reduce the Philippines' reliance on the UnitedStates and build much closer ties with China and Russian Federation.
"That's why we have community standards that explain what you can and cannot do on our service", a Facebook statement said.
The assistance helps military commanders in their fight against the militants and was offered at the request of the Philippine government, according to the statement, which didn't give details of the support.
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