You can watch the entire hearing above, and follow our liveblog commentary here. Engadget's Roberto Baldwin summed up the day's events:

FBI Director James Comey was grilled pretty hard by the committee. The majority of the representatives seemed to favor Congress working on a law that benefits law enforcement, security and privacy. Comey continued to note that the courts should figure this out.

While Comey continued to say that this is about single device in a single case, New York DA Cyrus Vance was more forthcoming that law enforcement is being hindered by encryption and that he would like the ability to open the one New York already has in its possession.

Apple general counsel Bruce Sewell raised Apple's ongoing argument that this is not about a single phone. The company does not want to comply with the Department of Justice order to help circumvent the iPhone's passcode. Representative Sensenbrenner asked Sewell if Apple had drafted legislation since it was not happy with the court's motion, Sewell replied that it had not. The attorney later said that it was open to working on a bill once the current debate was finished.

Dr. Susan Landau testified on the security implications of Apple unlocking the phone and noted that other government agencies could already have the capability of unlocking the iPhone that the FBI doesn't have. Landau said that the FBI should update its technical prowess instead of asking private companies to defeat their security.