Tesla set to unveil electric semi in Sept.

DETROIT — Tesla Inc. CEO Elon Musk says the company plans to unveil an electric semi-truck in September.

Musk tweeted the announcement Thursday. He offered no other details about the semi, such as whether it will be equipped with Tesla’s partially self-driving Autopilot mode.

Musk also said the company plans to unveil a pickup truck in 18 to 24 months.