Two people have been killed and three injured in three separate package explosions at homes in Austin, Tex., this month — crimes that have put the capital city on edge and prompted the police to warn residents not to even touch any unexpected packages.

Two of the blasts occurred on Monday just miles, and hours, apart, killing one person and injuring two others. The residents of the homes found a package outside their door that contained a powerful explosive device.

The police believe those attacks are connected to a deadly blast at another nearby Austin home on March 2.

The Austin interim police chief, Brian Manley, held two news conferences on Monday, one after each explosion, warning residents not to touch, move or handle any unexpected or suspicious packages. “Call 911,” he said. “It’s appropriate for residents to be concerned.”