BEIRUT, Lebanon – Witnesses and security officials say Shiite supporters of Hezbollah and Sunni backers of Lebanon's U.S.-allied government are clashing with automatic rifles and grenades.

The latest clashes follow a defiant speech by Hezbollah leader Hassan Nasrallah in which he said the militant organizations would respond with force to any attacks.

It is the second day of clashes that have turned some Beirut neighborhoods into battlegrounds. The sectarian confrontation have also spilled over to other parts of the country.

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