Oakland Raiders report to training camp

NAPA (KTVU) -- Summer break for NFL players are wrapping up as players have begun reporting to training camps in advance of the season's September start.

The San Francisco 49ers are expected to report to camp on Saturday, but Oakland Raiders players convened Thursday at the Napa Valley Marriott.

As many of them showed up to check in, it was clear that many Raiders players have colorful personalities and cars. Some of them showed up in flashy, high end cars and at least one rode into the camp on a motorcycle.

That would be fifth-year punter Marquette King, who turned up on the cycle wearing a green full-face Power Rangers mask. 

Friday will be the group's first full-team workout. Players who were sidelined because of injuries have been at the Marriot since Sunday.

The team's training camp is opening amid an ongoing probe by the NFL, which is investigating whether a video linked to an account from suspended Oakland Raiders linebacker Aldon Smith shows him using illegal drugs.

A video on a Periscope account that has shown Smith in the past features an unidentified man off camera discussing a rolled cigarette with an unidentified woman. It's not clear what's in the cigarette and who the man is. Smith sent out a tweet Monday after CSNBayArea.com reported on the video saying "Good try, not me."

NFL spokesman Brian McCarthy says the league is investigating.

Smith is serving a one-year suspension for violating the league's substance abuse policy that ends Nov. 17. He can apply for reinstatement in September. He gets regularly drug tested while on suspension.

KTVU sports reporter Jason Appelbaum and the Associated Press contributed to this report.