Meanwhile, investigators said after the shootout that killed Tamerlan Tsarnaev overnight Thursday into Friday, police realized the terror wasn’t over.
Police Commissioner Davis told CBS News’ “Face the Nation” that authorities found an arsenal of homemade explosives after a gun battle between police and the suspects in the Boston suburb of Watertown early Friday.
“There were over 250 rounds of extended ammunition that was found at the scene. This was a five- to 10-minute gun battle that occurred there, punctuated by loud explosions,” Davis continued, adding that the explosive devices were homemade.
The scene was loaded with unexploded bombs, and authorities had to alert arriving officers to them and clear the scene, Davis said. One improvised explosive device was found in the Mercedes the brothers are accused of carjacking, he said.
“This was as dangerous as it gets in urban policing,” Davis said.
Speaking on “60 Minutes” Sunday night, Davis would not say whether he believed Tsarnaev’s neck wound was a suicide attempt. When CBS News’ Scott Pelley asked if there was a chance that Tsarnaev might not make it, he answered that the suspect had suffered “very serious wounds.”
Investigators have been combing through the brothers’ lives to try to determine a motive.
In 2011, the FBI questioned Tamerlan about possible links to radical Islam.
U.S. Rep. Mike Rogers (R-Mich.), chairman of the House Intelligence Committee, said Tamerlan may have traveled overseas using an alias before the attack.
“That’s probably where he got that final radicalization to push him to commit acts of violence, and where he may have received training,” Rogers said.
Meantime, the American Civil Liberties Union and a federal public defender raised concerns about investigators’ plan to question Dzhokhar Tsarnaev without reading him his Miranda rights.
U.S. officials said an elite interrogation team would question the Massachusetts college student without reading him his Miranda rights, something that is allowed on a limited basis when the public may be in immediate danger, such as instances in which bombs are planted and ready to go off.
ACLU Executive Director Anthony Romero said the legal exception applies only when there is a continued threat to public safety and is “not an open-ended exception” to the Miranda rule, which guarantees the right to remain silent and the right to an attorney.
But some Republican lawmakers have said federal authorities should go even further than withholding Tsarnaev’s Miranda rights, and declare him an enemy combatant. That way, he could be questioned without a lawyer for a minimum of 30 days.
Former New York City Mayor Rudy Giuliani said doing so could mean better intelligence, prosecutions and even deterrence.
“These people are at war against us. We are in a war,” Giuliani said. “That’s why I think they should be called enemy combatants, because that they decided do an act of war against the United States. It wasn’t just a domestic crime.”
The federal public defender’s office in Massachusetts said it has agreed to represent Tsarnaev once he is charged. Miriam Conrad, public defender for Massachusetts, said he should have a lawyer appointed as soon as possible because there are “serious issues regarding possible interrogation.”