Section 26. Whoever, without lawful authority, forcibly or secretly confines or imprisons another person within this commonwealth against his will, or forcibly carries or sends such person out of this commonwealth, or forcibly seizes and confines or inveigles or kidnaps another person, with intent either to cause him to be secretly confined or imprisoned in this commonwealth against his will, or to cause him to be sent out of this commonwealth against his will or in any way held to service against his will, shall be punished by imprisonment in the state prison for not more than ten years or by a fine of not more than one thousand dollars and imprisonment in jail for not more than two years. Whoever commits any offence described in this section with the intent to extort money or other valuable thing thereby shall be punished by imprisonment in the state prison for life or for any term of years.

Whoever commits any offense described in this section while armed with a firearm, rifle, shotgun, machine gun or assault weapon shall be punished by imprisonment in the state prison for not less than ten years or in the house of correction for not more than two and one-half years. The provisions of the preceding sentence shall not apply to the parent of a child under 18 years of age who takes custody of such child. Whoever commits such offense described in this section while being armed with a firearm, rifle, shotgun, machine gun or assault weapon with the intent to extort money or other valuable thing thereby shall be punished by imprisonment in the state prison for life or for any term of years but not less than 20 years.

Whoever commits any offense described in this section while armed with a dangerous weapon and inflicts serious bodily injury thereby upon another person or who sexually assaults such person shall be punished by imprisonment in the state prison for not less than 25 years. For purposes of this paragraph the term ''serious bodily injury'' shall mean bodily injury which results in a permanent disfigurement, protracted loss or impairment of a bodily function, limb or organ or substantial risk of death. For purposes of this paragraph, the term ''sexual assault'' shall mean the commission of any act set forth in sections 13B, 13B1/2, 13B3/4, 13F, 13H, 22, 22A, 22B, 22C, 23, 23A, 23B, 24 or 24B.

Whoever, without lawful authority, forcibly or secretly confines or imprisons a child under the age of 16 within the commonwealth against his will or forcibly carries or sends such person out of the commonwealth or forcibly seizes and confines or inveigles or kidnaps a child under the age of 16 with the intent either to cause him to be secretly confined or imprisoned in the commonwealth against his will or to cause him to be sent out of the commonwealth against his will or in any way held to service against his will, shall be punished by imprisonment in the state prison for not more than 15 years. The provisions of the preceding sentence shall not apply to the parent of a child under 16 years of age who takes custody of such child.