The Beijing school where he worked was replacing its wooden window frames with metal ones.

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The Metal Building Material Business segment provides housing window sashes, building sashes, store facades, sashes for low-to-medium rise buildings, entranceway doors, various types of shutters, curtain walls, gates, carports, banisters, tide barriers, and smoke insulated screens.

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Typical townhouses in Havana were fitted with grand colonnaded portales (porches) to provide shade and shelter from the tropical weather, and rejas, metal bars, were secured over open window panes to protect against burglaries and allow for a freer circulation of air.

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For the glass wall overlooking the street, Ms. Lutz insisted on installing window coverings, strung on simple hospital-track metal fixtures, for privacy.

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Authorities' search of the jail cell showed that the two suspects apparently used a hacksaw to cut through metal bars covering a 1-by-3.5-foot window and then broke the glass to gain access to an outside courtyard, authorities said.

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