▁said ▁the ▁clock ▁was ▁" built ▁from ▁sc rap ▁around ▁the ▁house " ▁and ▁that ▁" some ▁of ▁the ▁bo ards ▁were ▁already ▁manufact ured ". ▁He ▁told ▁Larry ▁Wil more ▁on ▁The ▁Night ly ▁Show ▁that ▁it ▁took ▁him ▁only ▁" 1 0 ▁or ▁ 2 0 ▁minutes " ▁to ▁put ▁it ▁together ▁and ▁that ▁he ▁had ▁built ▁more ▁complicated ▁items ▁in ▁the ▁past ▁but ▁that ▁the ▁clock ▁was ▁simple , ▁using ▁some ▁parts ▁that ▁were ▁scra pped ▁off ▁so ▁that ▁it ▁was ▁easier . ▁According ▁to ▁the ▁initial ▁report ▁in ▁The ▁Dallas ▁Mor ning ▁News , ▁he ▁had ▁done ▁this ▁" before ▁bed ▁on ▁Sunday ▁[ Se ptember ▁ 1 3 , ▁ 2 0 1 5 ] ". ▁ ▁Ralph ▁Kub iak , ▁Moh amed ' s ▁sevent h - grade ▁history ▁teacher , ▁said ▁that ▁Moh amed ▁was ▁known ▁as ▁an ▁electron ics ▁enthus iast ▁with ▁a ▁history ▁of ▁being ▁discipl ined ▁for ▁using ▁a ▁hand made ▁remote ▁control ▁to ▁cause ▁a ▁class room ▁project or ▁to ▁mal function ▁on ▁command . ▁Moh amed ▁was ▁also ▁noted ▁for ▁making ▁a ▁battery ▁char ger ▁to ▁help ▁re charge ▁the ▁cell phone ▁of ▁a ▁school ▁t utor . ▁The ▁Dallas ▁Mor ning ▁News ▁commented , ▁"[ s ] ome ▁of ▁these ▁cre ations ▁looked ▁much ▁like ▁the ▁inf am ous ▁clock ▁– ▁a ▁mess ▁of ▁w ires ▁and ▁exposed ▁circ uits ▁stuff ed ▁inside ▁a ▁h ing ed ▁case , ▁perhaps ▁susp icious ▁to ▁some ." ▁According ▁to ▁the ▁Guardian ,