President Barack Obama says there is no excuse for the use of excessive force by police in the tense aftermath of the shooting death of an unarmed black teenager in Ferguson, Missouri, and no excuse for violence against the police.

In brief remarks near his vacation spot in Martha's Vineyard, Obama said he wants an open and transparent investigation of the shooting death of 18-year-old Michael Brown, so that justice is done.

He also said police shouldn't be arresting and bullying journalists who are doing their jobs. Two reporters were taken into custody and briefly jailed Wednesday evening in the St. Louis suburb.

Police in Ferguson, Missouri, are defending their use of tear gas and smoke bombs, after another night of chaos in the St. Louis suburb in the aftermath of the shooting death of 18-year-old Michael Brown.

Police say officers last night tossed tear gas to disperse a large crowd of protesters after some threw Molotov cocktails and rocks at officers. More than 10 people were arrested.

A police spokesman says it's "scary" for officers dealing with the protests -- who hear gunshots and "don't know where they're coming from."


But the response is drawing criticism. Civil rights activist Al Sharpton says the Justice Department should monitor the way the police are handling the crisis.

President Obama has also asked the FBI and the Department of Justice to investigate the death of the teen.