"Alphabet Stock Tumbles in Thursday Morning Trading"

Alphabet's stock stumbled as much as 3.8% following troubling reports of collisions involving its Waymo self-driving car unit, prompting a 2.7% drop by midday. Waymo filed a voluntary recall report for software that powered its fleet after two separate incidents in Phoenix, Arizona, involving collisions with improperly towed vehicles. This comes amid a series of recent incidents involving Waymo vehicles, raising concerns about the readiness of self-driving technology.